olefin vs aliphatic compound

olefin and aliphatic compound both are nouns.

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

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

olefin: any unsaturated aliphatic hydrocarbon
aliphatic compound: organic compound that is an alkane or alkene or alkyne or their derivative

olefin (noun)	aliphatic compound (noun)
any unsaturated aliphatic hydrocarbon	organic compound that is an alkane or alkene or alkyne or their derivative