smart vs thirst

smart and thirst both are nouns.

Word	Noun	Adjective	Verb	Adverb
smart	Yes	Yes	Yes	No
thirst	Yes	No	Yes	No

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

Other hyponyms of smart include bite, burn, sting, burn, itch, hunger, act up, throb, shoot.

smart (noun)	thirst (noun)
a kind of pain such as that caused by a wound or a burn or a sore	strong desire for something (not food or drink)
	a physiological need to drink

smart (adjective)	thirst (adjective)
showing mental alertness and calculation and resourcefulness
capable of independent and apparently intelligent action
quick and brisk
improperly forward or bold
characterized by quickness and ease in learning
painfully severe
elegant and stylish

smart (verb)	thirst (verb)
be the source of pain	have a craving, appetite, or great desire for
	feel the need to drink