propene vs propylene

propene and propylene both are nouns.

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

As nouns, propene and propylene are synonyms defined as:

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

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