perspiration vs secretion

perspiration and secretion both are nouns.

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

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

perspiration: salty fluid secreted by sweat glands
secretion: a functionally specialized substance (especially one that is not a waste) released from a gland or cell

perspiration (noun)	secretion (noun)
salty fluid secreted by sweat glands	a functionally specialized substance (especially one that is not a waste) released from a gland or cell
the process of the sweat glands of the skin secreting a salty fluid	the organic process of synthesizing and releasing some substance