propylene vs propene

propylene and propene both are nouns.

Word	Noun	Adjective	Verb	Adverb
propylene	Yes	No	No	No
propene	Yes	No	No	No

As nouns, propylene and propene are synonyms defined as:

propylene and propene: a flammable gas obtained by cracking petroleum; used in organic synthesis

propylene (noun)	propene (noun)
a flammable gas obtained by cracking petroleum; used in organic synthesis	a flammable gas obtained by cracking petroleum; used in organic synthesis