anestrus vs anoestrus

anestrus and anoestrus both are nouns.

Word	Noun	Adjective	Verb	Adverb
anestrus	Yes	No	No	No
anoestrus	Yes	No	No	No

As nouns, anestrus and anoestrus are synonyms defined as:

anestrus and anoestrus: applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus

Other synonyms of anestrus include anestrum, anoestrum.

anestrus (noun)	anoestrus (noun)
applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus	applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus