sweat vs straining

sweat and straining both are nouns.

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

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

sweat (noun)	straining (noun)
use of physical or mental energy; hard work	the act of distorting something so it seems to mean something it was not intended to mean
salty fluid secreted by sweat glands	an intense or violent exertion
condensation of moisture on a cold surface
agitation resulting from active worry

sweat (adjective)	straining (adjective)
	taxing to the utmost; testing powers of endurance

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