react vs buck

react is not a noun while buck is a noun.

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

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

Other hyponyms of react include act on, follow up on, pursue, go against.

react (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

react (verb)	buck (verb)
undergo a chemical reaction; react with another substance under certain conditions	jump vertically, with legs stiff and back arched
show a response or a reaction to something	move quickly and violently
act against or in opposition to	resist
	to strive with determination