buck vs strive

buck is a noun but strive is not a noun.

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

As verbs, strive is a hypernym of buck; that is, strive is a word with a broader meaning than buck:

Other hypernyms of buck include endeavor, endeavour.

buck (noun)	strive (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

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