polyhidrosis vs perspiration

polyhidrosis and perspiration both are nouns.

Word	Noun	Adjective	Verb	Adverb
polyhidrosis	Yes	No	No	No
perspiration	Yes	No	No	No

As nouns, perspiration is a hypernym of polyhidrosis; that is, perspiration is a word with a broader meaning than polyhidrosis:

polyhidrosis: excessive and profuse perspiration
perspiration: the process of the sweat glands of the skin secreting a salty fluid

Other hypernyms of polyhidrosis include diaphoresis, hidrosis, sudation, sweating.

polyhidrosis (noun)	perspiration (noun)
excessive and profuse perspiration	salty fluid secreted by sweat glands
	the process of the sweat glands of the skin secreting a salty fluid