nitril vs vinyl cyanide

nitril and vinyl cyanide both are nouns.

Word	Noun	Adjective	Verb	Adverb
nitril	Yes	No	No	No
vinyl cyanide	Yes	No	No	No

As nouns, vinyl cyanide is a hyponym of nitril; that is, vinyl cyanide is a word with a more specific, narrower meaning than nitril:

nitril: any of a class of organic compounds containing the cyano radical -CN
vinyl cyanide: a colorless liquid unsaturated nitrile made from propene

Other hyponyms of nitril include acrylonitrile, propenonitrile.

nitril (noun)	vinyl cyanide (noun)
any of a class of organic compounds containing the cyano radical -CN	a colorless liquid unsaturated nitrile made from propene