elbow grease vs sweat

elbow grease and sweat both are nouns.

Word	Noun	Adjective	Verb	Adverb
elbow grease	Yes	No	No	No
sweat	Yes	No	Yes	No

As nouns, elbow grease and sweat are synonyms defined as:

Other synonyms of elbow grease include effort, exertion, travail.

elbow grease (noun)	sweat (noun)
use of physical or mental energy; hard work	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

elbow grease (verb)	sweat (verb)
	excrete perspiration through the pores in the skin