anoestrus vs anoestrum

anoestrus and anoestrum both are nouns.

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

As nouns, anoestrus and anoestrum are synonyms defined as:

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

Other synonyms of anoestrus include anestrum, anestrus.

anoestrus (noun)	anoestrum (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