limonene vs terpene

limonene and terpene both are nouns.

Word	Noun	Adjective	Verb	Adverb
limonene	Yes	No	No	No
terpene	Yes	No	No	No

As nouns, terpene is a hypernym of limonene; that is, terpene is a word with a broader meaning than limonene:

limonene: a liquid terpene with a lemon odor; found in lemons and oranges and other essential oils
terpene: an unsaturated hydrocarbon obtained from plants

limonene (noun)	terpene (noun)
a liquid terpene with a lemon odor; found in lemons and oranges and other essential oils	an unsaturated hydrocarbon obtained from plants