physical exercise vs sweat

physical exercise and sweat both are nouns.

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

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

physical exercise: 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 exercise include effort, elbow grease, exertion, travail.

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