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)

A
Aboideaux

Abomasum

Adscititious

Amakwerekwere

Amphisbaena

Anfractuous

Anguilliform

Anthersmut

Apfelstrudel

Argute

Archaeopteryx

Astrobleme

Autotomy

B
Banderillero

Bandoline

Banjax

Bangalay

Benthos

Bergschrund

Blatherskite(s)

Boilover

Borborygmus

Boxwallah

Bravura

Breatharian

Brouhaha

Bruhaha

Burnsides

C
Cacafuego

Cacoethes

Canorous

Callipygian

Callithumpian

Carmagnole

Chiliad

Chanticleer

Chateaubriand

Chechaquo

Chrysoberyl

Clepsydra

Cokuloris

Coloquintida

Colporteur

Comess

Commensalism

Concinnity

Conniption

Coriaceous

Cracovienne

Criticaster

Cryptozoology

Cyanic

Cybersquatting

Czareviches

D
Daimokus

Dandiprat

Dariole

Deasil

Decubitus

Defervescence

Deracinate

Dharmsala

Diezeugmenon

Digerati

Disenthral

Disaccharide

Divaricate

Dohyo

Doryphore

Dragoman

Dulciloquy

Dukkeripen

Duumvirate

E
Edacious

Effable

Einkorn

Eleemosynary

Ektexine

Ensorcell

Entomophagy

Ergometer(s)

Erubescent

Ervalenta

Estranghelo

Eurythmic

Eviternity

Exsanguine

Extramundane

F
Fauxbourdon

Fahlerz

Festschrift

Fibranne

Flocculent

Foederatus

Forehandednesses

Frangipani

Frankalmoign

Fraxinella

Freehandednesses

Funambulist

Furuncle

Futhark

Futz

G
Galligaskins

Gedankenexperiments

Gegenschein

Gemutlichkeit

Genistein

Glockenspiel

Gobbledygook

Gohonzon

Gruyere

H
Hackmatack

Hallux

Hartebeest

Haruspex

Hide-and-seek

Hojatoleslam

Humdudgeon

Hygge

I
Incarnadine

Incrassate

Indinavir

Incunabula

Iontophoresis

Ixia

Izvestiya

J
Jamahiriya

Jambalaya

Jasmonate

Jinriksha

Jipijapa

Jumentous

Jovial

Jovysaunce

K
Kahikatea

Kaikawaka

Kaikomako

Kalamdan

Kamaaina

Kantikoy

Karateka

Kashruth

Katsura

Kenspeckle

Kerseymere

Kestrel

Khaddar

Kikuyu

Klebsiella

Koftgari

Kouskous

Krakowiak

L
Lactarium

Langostino

Lavalava

Lazzaroni

Leylandii

Liripipe

Logomachy

Lollapalooza

Luculent

Luftmensch

Lwei

Lycanthropy

Lysosomal

M
Mahewu

Malacostracan(s)

Malentendu

Mamaguying

Merveilleux

Mishmashes

Mim

Mimsy

Monchiquite

Moonraker

Mpret

N
Naartjie

Nachtmaal

Ne'er-do-weel

Nenuphar

Nickumpoop

Nomenklatura

Nonchruchgoer(s)

Numnah

Nunatak

O
Omadhaun

Omnicompetence

Omophagy

Omphalos

Onychocryptosis

Oojamaflip

Opsimath

Organochlorine

Oxyrhynchus

Oyeze

Ozeki

P
Paradente

Pavonazzo

Pedicular

Piwakawaka

Pompholyx

Pozzolana

Pranayama

Privatdozent

Psalmody

Pulchritudinous

Q
Qalamdan

Qindarka

Quidnunc

Quincunx

R
Raconteur

Raillery

Ramekin

Ratah

Rensselaerite

Rubicund

Rudbeckia

S
Sackbut

Satyagrahi

Sesquipedalian

Shiitake

Skimmington

Shadchanim

Shakuhachi

Shammasim

Shamiyanah

Shavasana

Shekel

Shibuichi

Shidduchim

Shivoo

Sokaiya

Stichomythia

Stukkend

Suedehead

T
Tableaux

Tawheowheo

Tibiofibulae

Tikoloshe

Timenoguy

Triskaidekaphobia/Triskaidekaphobic

Tsesarewitches

Tsktsking

Tumatakuru

Turangawaewae

U
Uniped

Unconscionable

Usquebaugh

V
Vaivode

Valvassor

Vedutisti

Vetiver

Vihuela

Voortrekker

Vouvray

W
Whatshername(s)

Whatshisname(s)

Whippoorwill's-shoe

Whatchamacallit

Witwanton

Woiwode

X
Xanthan

Xanthophobia

Xenodiagnosis

Xystos

Y
Yahrzeit

Yakitori

Yfere

Yukata

Z
Zabaglione

Zabajone

Zante

Zantedeschia

Zantewood

Zeitgeist

Zemstvo

Zikkurat

Zwischenzug Zugzwang