retrospect vs rumination

retrospect and rumination both are nouns.

Word	Noun	Adjective	Verb	Adverb
retrospect	Yes	No	Yes	No
rumination	Yes	No	No	No

As nouns, rumination is a hypernym of retrospect; that is, rumination is a word with a broader meaning than retrospect:

Other hypernyms of retrospect include contemplation, musing, reflection, reflexion, thoughtfulness.

retrospect (noun)	rumination (noun)
contemplation of things past	regurgitation of small amounts of food; seen in some infants after feeding
	(of ruminants) chewing (the cud)
	a calm, lengthy, intent consideration

retrospect (verb)	rumination (verb)
look back upon (a period of time, sequence of events); remember