cycloolefin vs alkene

cycloolefin and alkene both are nouns.

Word	Noun	Adjective	Verb	Adverb
cycloolefin	Yes	No	No	No
alkene	Yes	No	No	No

As nouns, alkene is a hypernym of cycloolefin; that is, alkene is a word with a broader meaning than cycloolefin:

cycloolefin: alkene hydrocarbon which contains a closed ring of carbon atoms, but has no aromatic character.
alkene: any unsaturated aliphatic hydrocarbon

Other hypernyms of cycloolefin include olefin, olefine.

cycloolefin (noun)	alkene (noun)
alkene hydrocarbon which contains a closed ring of carbon atoms, but has no aromatic character.	any unsaturated aliphatic hydrocarbon