fringe benefit vs benefit

fringe benefit and benefit both are nouns.

Word	Noun	Adjective	Verb	Adverb
fringe benefit	Yes	No	No	No
benefit	Yes	No	Yes	No

As nouns, benefit is a hypernym of fringe benefit; that is, benefit is a word with a broader meaning than fringe benefit:

fringe benefit: an incidental benefit awarded for certain types of employment (especially if it is regarded as a right)
benefit: financial assistance in time of need

fringe benefit (noun)	benefit (noun)
an incidental benefit awarded for certain types of employment (especially if it is regarded as a right)	something that aids or promotes well-being
	a performance to raise money for a charitable cause
	financial assistance in time of need

fringe benefit (verb)	benefit (verb)
	derive a benefit from
	be beneficial for