sweat vs swither

sweat and swither both are nouns.

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

As nouns, sweat and swither are synonyms defined as:

Other synonyms of sweat include fret, lather, stew.

sweat (noun)	swither (noun)
use of physical or mental energy; hard work	agitation resulting from active worry
salty fluid secreted by sweat glands
condensation of moisture on a cold surface
agitation resulting from active worry

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