strive vs buck

strive is not a noun while buck is a noun.

Word	Noun	Adjective	Verb	Adverb
strive	No	No	Yes	No
buck	Yes	No	Yes	No

As verbs, buck is a hyponym of strive; that is, buck is a word with a more specific, narrower meaning than strive:

Other hyponyms of strive include struggle, be at pains, take pains.

strive (noun)	buck (noun)
	mature male of various mammals (especially deer or antelope)
	a framework for holding wood that is being sawed
	a gymnastic horse without pommels and with one end elongated; used lengthwise for vaulting
	a piece of paper money worth one dollar

strive (verb)	buck (verb)
to exert much effort or energy	jump vertically, with legs stiff and back arched
attempt by employing effort	move quickly and violently
	resist
	to strive with determination