anoestrum vs anestrus

anoestrum and anestrus both are nouns.

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

As nouns, anoestrum and anestrus are synonyms defined as:

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

Other synonyms of anoestrum include anestrum, anoestrus.

anoestrum (noun)	anestrus (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