anoestrum vs anestrum

anoestrum and anestrum both are nouns.

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

As nouns, anoestrum and anestrum are synonyms defined as:

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

Other synonyms of anoestrum include anestrus, anoestrus.

anoestrum (noun)	anestrum (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