sweat vs perspire

sweat is a noun but perspire is not a noun.

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

As verbs, sweat and perspire are synonyms defined as:

Other synonyms of sweat include sudate.

sweat (noun)	perspire (noun)
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

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