anoestrum vs anoestrus

anoestrum and anoestrus both are nouns.

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

As nouns, anoestrum and anoestrus are synonyms defined as:

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

Other synonyms of anoestrum include anestrum, anestrus.

anoestrum (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