acetylene vs aliphatic compound

acetylene and aliphatic compound both are nouns.

Word	Noun	Adjective	Verb	Adverb
acetylene	Yes	No	No	No
aliphatic compound	Yes	No	No	No

As nouns, aliphatic compound is a hypernym of acetylene; that is, aliphatic compound is a word with a broader meaning than acetylene:

acetylene: a colorless flammable gas used chiefly in welding and in organic synthesis
aliphatic compound: organic compound that is an alkane or alkene or alkyne or their derivative

acetylene (noun)	aliphatic compound (noun)
a colorless flammable gas used chiefly in welding and in organic synthesis	organic compound that is an alkane or alkene or alkyne or their derivative