Yes, ethynyl is in the scrabble dictionary

...and is worth 15 points by itself.

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Ethynyl Definition

noun

The univalent radical HC≡C- derived from acetylene.

from the English-language Wiktionary

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Top Words by points	Points
ethynyl	16

2 letter words with ETHYNYL	Points
el	2
ne	2
te	2
ye	5
he	5
eh	5
et	2
en	2

3 letter words with ETHYNYL	Points
yen	6
yeh	9
tye	6
thy	9
the	6
ten	3
tel	3
nth	6
net	3
yet	6
lye	6
ley	6
let	3
hey	9
het	6
hen	6
eth	6

4 letter words with ETHYNYL	Points
lent	4
hyte	10
hent	7
then	7
they	10
tyne	7

5 letter words with ETHYNYL	Points
ethyl	11

7 letter words with ETHYNYL	Points
ethynyl	16

Found 33 words in 0.21557 seconds