crude vs fossil oil

crude and fossil oil both are nouns.

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

As nouns, crude and fossil oil are synonyms defined as:

Other synonyms of crude include crude oil, oil, petroleum, rock oil.

crude (noun)	fossil oil (noun)
a dark oil consisting mainly of hydrocarbons	a dark oil consisting mainly of hydrocarbons

crude (adjective)	fossil oil (adjective)
not refined or processed
belonging to an early stage of technical development; characterized by simplicity and (often) crudeness
conspicuously and tastelessly indecent
not processed or subjected to analysis
devoid of any qualifications or disguise or adornment
not carefully or expertly made