vested interest vs interest

vested interest and interest both are nouns.

Word	Noun	Adjective	Verb	Adverb
vested interest	Yes	No	No	No
interest	Yes	No	Yes	No

As nouns, interest is a hypernym of vested interest; that is, interest is a word with a broader meaning than vested interest:

vested interest: groups that seek to control a social system or activity from which they derive private benefit
interest: (usually plural) a social group whose members control some field of activity and who have common aims

Other hypernyms of vested interest include interest group.

As nouns, interest is a hypernym of vested interest; that is, interest is a word with a broader meaning than vested interest:

vested interest: (law) an interest in which there is a fixed right to present or future enjoyment and that can be conveyed to another
interest: (law) a right or legal share of something; a financial involvement with something

Other hypernyms of vested interest include stake.

vested interest (noun)	interest (noun)
groups that seek to control a social system or activity from which they derive private benefit	a diversion that occupies one's time and thoughts (usually pleasantly)
(law) an interest in which there is a fixed right to present or future enjoyment and that can be conveyed to another	a reason for wanting something done
	the power of attracting or holding one's attention (because it is unusual or exciting etc.)
	a sense of concern with and curiosity about someone or something
	(usually plural) a social group whose members control some field of activity and who have common aims
	a fixed charge for borrowing money; usually a percentage of the amount borrowed
	(law) a right or legal share of something; a financial involvement with something

vested interest (verb)	interest (verb)
	excite the curiosity of; engage the interest of
	be of importance or consequence
	be on the mind of