autacoid vs secretion

autacoid and secretion both are nouns.

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

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

autacoid: any physiologically active internal secretion especially one of uncertain classification
secretion: a functionally specialized substance (especially one that is not a waste) released from a gland or cell

autacoid (noun)	secretion (noun)
any physiologically active internal secretion especially one of uncertain classification	a functionally specialized substance (especially one that is not a waste) released from a gland or cell
	the organic process of synthesizing and releasing some substance