cogitation vs thoughtfulness

cogitation and thoughtfulness both are nouns.

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

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

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

cogitation (noun)	thoughtfulness (noun)
attentive consideration and meditation	a considerate and thoughtful act
a carefully considered thought about something	the trait of thinking carefully before acting
	kind and considerate regard for others
	a calm, lengthy, intent consideration