physical exertion vs sweat

physical exertion and sweat both are nouns.

Word	Noun	Adjective	Verb	Adverb
physical exertion	Yes	No	No	No
sweat	Yes	No	Yes	No

As nouns, sweat is a hypernym of physical exertion; that is, sweat is a word with a broader meaning than physical exertion:

physical exertion: the activity of exerting your muscles in various ways to keep fit
sweat: use of physical or mental energy; hard work

Other hypernyms of physical exertion include effort, elbow grease, exertion, travail.

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

physical exertion (verb)	sweat (verb)
	excrete perspiration through the pores in the skin