sweat vs workout

sweat and workout both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweat	Yes	No	Yes	No
workout	Yes	No	No	No

As nouns, workout is a hyponym of sweat; that is, workout is a word with a more specific, narrower meaning than sweat:

sweat (noun)	workout (noun)
use of physical or mental energy; hard work	the activity of exerting your muscles in various ways to keep fit
salty fluid secreted by sweat glands
condensation of moisture on a cold surface
agitation resulting from active worry

sweat (verb)	workout (verb)
excrete perspiration through the pores in the skin