cogitation vs contemplation

cogitation and contemplation both are nouns.

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

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

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

cogitation (noun)	contemplation (noun)
attentive consideration and meditation	a long and thoughtful observation
a carefully considered thought about something	a calm, lengthy, intent consideration