Words that only work in specific generations

Here are all the words that only works in specific generations.

C
Cly

Cry

Csc

D
Dry

Dryly

Dye

E
Ex

Eye

G
Glycyl

Gynny

J
Juju

K
Kyu

L
Lynx

M
Myxo

O
Ox

Oy

P
Pygmy

Q
QR

S
Sky

Sly

Slyly

Spryly

Syzygy

T
Twy

Tyg

Tygs

V
Vly

X
Xylyl

Y
Yo

Yo-yo

Ye

Z
ZZZ

ZZZs