anovulation vs ovulation

anovulation and ovulation both are nouns.

Word	Noun	Adjective	Verb	Adverb
anovulation	Yes	No	No	No
ovulation	Yes	No	No	No

anovulation (noun)	ovulation (noun)
the absence of ovulation due to immaturity or post-maturity or pregnancy or oral contraceptive pills or dysfunction of the ovary	the expulsion of an ovum from the ovary (usually midway in the menstrual cycle)