retrospect vs thoughtfulness

retrospect and thoughtfulness both are nouns.

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

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

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

retrospect (noun)	thoughtfulness (noun)
contemplation of things past	a considerate and thoughtful act
	the trait of thinking carefully before acting
	kind and considerate regard for others
	a calm, lengthy, intent consideration

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