resid vs fossil oil

resid and fossil oil both are nouns.

Word	Noun	Adjective	Verb	Adverb
resid	Yes	No	No	No
fossil oil	Yes	No	No	No

As nouns, fossil oil is a hypernym of resid; that is, fossil oil is a word with a broader meaning than resid:

Other hypernyms of resid include crude, crude oil, oil, petroleum, rock oil.

resid (noun)	fossil oil (noun)
oil products that remain after petroleum has been distilled	a dark oil consisting mainly of hydrocarbons