alkene vs cycloolefin

alkene and cycloolefin both are nouns.

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

As nouns, cycloolefin is a hyponym of alkene; that is, cycloolefin is a word with a more specific, narrower meaning than alkene:

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

Other hyponyms of alkene include ethene, ethylene, cycloalkene, hexine.

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