List of expert words

The alphabetical list of words here are rare and only some people know about it. Source YT video: (Lavalava, others not included in source)

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Reminder: Long words aren't always considered expert words!

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A
Aalii(s)

Araara(s)

Antidisestablishmentarianism

Abyssopelagic

Acetylsalicylate

Acciaccatura

Adenocarcinomas

Adscititious

Adzelike

Aeroballistic(s)

Aerothermodynamic(s)

Agrostemma

Albespyne

Aflaj

Altazimuth

Amakwerekwere

Amritattva

Amphisbaena

Amaranthaceous

Anaclises

Anacoluthon

Aniseikonia

Anguilliform

Antieavesdropping

Antihypertensive(s)

Antischizophrenia/c

Antisyzyg(y/ies)

Appoggiatura

Apfelstrudel

Arctiid(s)

Arfvedsonite

Arrhenotoky

Arikis

Ashtanga

Asklent

Assegaaiing

Ataata(s)

Autarkik

Awmrie

Azulejo

Arcsin(s)

Arcsine(s)

Arccos(ses)

Arccosine(s)

Arctan(s)

Arctangent(s)

B
Baaskaap

Banderillero

Bandoline

Banjax(es)

Bangalay

Barmitzvah(s)

Benthos

Benzanthracene

Bergschrund

Bhikkhuni

Bizjet

Blatherskite(s)

Blutwurst

Boilover

Borborygmus

Bougainvillaea

Boxwallah

Bronchopneumonia(s)

Braai(ing)/(s)

Bravura

Breatharian

Brouhaha

Bruhaha

Buqsha

Burnsides

(Super)bazaar(s)

C
Cacafuego

Cacoethes

Canorous

Capercaillie

Callipygian

Callithumpian

Carmagnole

Chiliad

Chanticleer

Chateaubriand

Chautauqua

Chechaquo

Chinachina

Churrigueresque

Cephalochordate(s)

Chrysoberyl

Clepsydra

Cokuloris

Coloquintida

Colporteur

Comess

Commensalism

Concinnity

Congii

Conniption

Coriaceous

Counter(-)Counter(-)measures

Cracovienne

Criticaster

Crossopterygian

Cryptozoology

Cummingtonite(s)

Cyanic

Cybersquatting

Cynghanedd(s)

Czareviches

Caterwaul(ing)

D
Daimokus

Dandiprat

Dariole

Deasil

Decubitus

Defervescence

Dharmshala

Doxycycline

Deracinate

Dharmsala

Diezeugmenon

Digerati

Disenthral

Disaccharide

Divaricate

Dogsbody/ies/ing(s)/ied

Dohyo

Doryphore

Dragoman

Duhkha

Dulciloquy

Dukkeripen

Durchkomponiert

Duumvirate(s)

Dzeren(s)

Dzo(s)

E
Ecclesiastic(ism)(s)

Edacious

Effable

Einkorn

Eleemosynary

Ektexine

Embourgeoisement

Emmenagogue

Ensorcell

Entomophagy

Enzymological

Ergometer(s)

Erubescent

Ervalenta

Estranghelo

Ethylenediaminetetraacetates

Eurythmic

Eviternity

Exsanguine

Extramundane

Electrocordiograph(ically)

F
Fauxbourdon

Fahlerz

Festschrift

Fibranne

Fizzgig

Flocculent

Flimflam(mery)

Flibbertigibbet(s)

Foederatus

Forehanded(ness[es])

Frangipani

Frankalmoign

Fraxinella

Freehanded(ness[es])

Fricandeau(x)

Funambulist

Furuncle

Futhark

Futz

Fyke(s)

Fylfot

G
Galligaskins

Gedankenexperiments

Gegenschein

Gemutlichkeit

Gewurztraminer

Genistein

Gjetost(s)

Glockenspiel

Gobbledygook

Gohonzon

Gruyere

H
Hackmatack

Hackerazzis

Hajj(es)

Hadji(s)

Hadj(s)

Halakahs

Hallux

Hartebeest

Haruspex

Hermaphrodite

Hermaphroditism

Hide-and-seek

Hojatoleslam

Humdudgeon

Hwyl

Hygge

Hydrocellulose(s)

Hmmm

Highjinks

Hobbledehoy(s)/hood/dom/ism(s)

Hypnagogic

I
iamb((u(se))s)

Ijtihad

Incarnadine

Incrassate

Indinavir

Incunabula

Iontophoresis

Isoantigenic

Ixia

Izvestiya

J
Jamahiriya

Jambalaya

Jasmonate

Jhatka(s)

Jinriksha

Jipijapa

Johnnycake(s)

Jumentous

Jovial

Jovysaunce

K
Kabaddi

Kaffirboom

Kahikatea

Kaikawaka

Kaikomako

Kakapo(s)

Kakariki(s)

Kalamdan

Kamaaina

Kamela

Kamikaze(s)

Kamotiqs

Kantikoy

Karateka

Karuhiruhi

Kashruth

Katsura

Katzenjammer(s)

Kavakava(s)

Kawakawa(s)

Kawanatanga

Kazatzka

Kefir

Keffiyeh

Kellaut

Kenspeckle

Keratinophilic

Kerfuffle(s)

Kerseymere

Kestrel

Kex

Khaddar

Khansamah

Khidmutgar

Kgotla

Khansamah

Kiaat

Kirschwasser(s)

Kikoi(s)

Kikuyu

Kinnikinnick(s)

Klangfarbe

Klebsiella

Klipspringer

Knackwurst

Koekoea

Koftgari

Kokowai

Kolkhoz/es/nik/niki

Komitaji

Kopiyka

Kopje

Koulibiaca

Kouskous

Krakowiak

Kumarahou

Kurrajong

Kwaito

Kwashiorkor

L
Laager(s)

Lactarium

Landsknecht

Langostino

Lansquenet

Latitud(inarian)(ism)(s)

Lavalava

Lazzaroni

Leukaemogenesis

Leylandii

Liripipe

Logomachy

Lollapalooza

Luculent

Luftmensch

Lwei

Lycanthropy

Lysosomal

Lehr(s)

Lehrjahre

M
M(a)atjes

Mesembryanthemum(s)

Mesdemoiselles

Mesencephalon(s)

Magnetostriction(s)

Magnetoresistance

Maharajah

Mahewu

Malacostracan(s)

Malentendu

Mbaqanga

Mamaguying

Merveilleux

Meshuggeneh

Mishmashes

Middelmannetjie

Milquetoast

Mim

Mimsy

Mnemotechnics

Monocotyledonous

Monchiquite

Moonraker

Mosbolletjie

Muumuu

Mpret

Mridangam

Mujahedeen

Muumuu(s)

Myelosuppression

Mzungu

N
Naartjie(s)

Nachtmaal

Nanotechnology(ies)

Nduja

Ne'er-do-weel(s)

Nenuphar

Nincompoop(s)/(er(y/ies))

Nickumpoop(s)

Nomenklatura

(Non)chruchgoer(s)

Numnah

Nunatak

Nabks

O
Objet

Obstreperous

Omadhaun

Omnicompetence

Omophagy

Omphalos

Onychocryptosis

Oojamaflip

Oxyphenbutazone(s)

Opsimath

Organochlorine

Osteoarthritic(s)

Oxyrhynchus

Oyez

Ozeki

Opgefok

Ovolactovegetarian(s)

Ovoviviparous[ness(es)]

P
Paczki

Pancreozymin

Paradente

Pavonazzo

Pedicular

Pipiwharauroa

Pirozhki

Piwakawaka(s)

Plenipotentia/ry/ries

Pompholyx

Polysaccharide(s)

Porbeagle(s)

Potjie(s)

Pozzuolana

Pneumokoniosis

Praam

Prajna

Pranayama

Privatdozent

Psalmbook

Psalmody

Psaltery/ies

Psalterium

Pseud

Pseudo-anglicism

Ptarmigan(s)

Pulchritudinous

Phthirias(i/e)s

Q
Qajaq(s)

Qalamdan

Qanat

Qasida

Qawwali(s)

Qindarka

Qoph

Quidnunc

Quincunx

Quipu(s)

Qulliq

Qwerty(s)/ies

R
Raconteur

Raillery

Ramequin

Ramgunshoch

Rangatiratanga

Rapprochement

Ratah

Ratatouille

Razzmatazz(es)

Rensselaerite

Rhyparography

Rigsdaler

Rijksdaaler

Rubicund

Rudbeckia

Rufiyaa(s)

Rationalization

Razz(ing/ed/es)

S
Sackbut

Samekh(S)

Satyagrahi

Schistosomiasis

Schizocarp(s)

Schlemiehl

Sempre

Sesquipedalian

Sforzando

Shamiyanah

Sjambok(s)

Skikjoring

Skimmington

Shadchan/im

Shakuhachi

Shammasim

Shamiyanah

Shakuhachi

Shavasana

Sheqalim

Shekel

Sheqel

Shibuichi

Shidduchim

Shiitake(s)

Shivoo

Sixaine

Shongololo

Sokaiya

Skyr(s) (only works in bullet mode)

Something'll

Sphygmomanometry

Stichomythia

Stukkend

Suedehead

Superheterodyne

Shhh

Svelte/ly/ness(es)

Syzyg(y/ies)

T
Tableau(x)

Taeniafuge

Tarsometatarsus

Tawheowheo

Thrombophlebitis

Tibiofibulae

Tibouchina

Tikoloshe

Timenoguy

Tiktaalik(s)

Tjanting(s)

Triskaidekaphobia(s)

Tsetse(s)

Ts(es)arewi(t)ch(es)

Ts(es)arevi(t)ch(es)

Tsitsith

Tsktsk(ing/ed/s)

Tsotsitaal

Tuatara(s)

Tumatakuru(s)

Turangawaewae

Tmesis

Turntablists

Tsutsugamushi(s)

Telecommunication(s)

Tzatziki(s)

U
Uniped

Uakari

Unconscionable

Unununium(s)

Ununennium(s)

Usquebaugh

V
Vaivode

Valvassor

Vedutisti

Vizsla

Vetiver

Vihuela

Voortrekker

Vouvray

W
Whippoorwill's-boot(s)

Weltanschauung(s)/(en)

Whatshername(s)

Whatshisname(s)

Whatsitsname(s)

Whippoorwill's-shoe(s)

Whatchamacallit

Wishtonwish

Witgatboom

Witwanton

Woiwode

Wysiwyg

Wapinschaw(s)

Wappenschaw(ing(s))

Weft(ing/ed/s)

X
Xanthan

Xanthophobia

Xenodiagnosis

Xenotransplantation(s)

Xerus(es)

Xiphisternum

Xystos

Y
Yahrzeit

Yakitori

Yfere

Yglaunst

Ylke(s)

Yslaked

Yttrium

Yukata

Ywis

Z
Zabaglione

Zabajone

Zante

Zantedeschia

Zantewood

Zeitgeist

Zemstvo

Zinjanthropus(es)

Zikkurat

Zizyphus(es)

Zwischenzug

Zugzwang

Zymotechnic

Zyzzyva(s)

Zzz(s)