think over vs cogitate

think over and cogitate both are verbs.

Word	Noun	Adjective	Verb	Adverb
think over	No	No	Yes	No
cogitate	No	No	Yes	No

As verbs, cogitate is a hypernym of think over; that is, cogitate is a word with a broader meaning than think over:

think over: reflect deeply on a subject
cogitate: use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments

Other hypernyms of think over include cerebrate, think.

As verbs, cogitate is a hyponym of think over; that is, cogitate is a word with a more specific, narrower meaning than think over:

think over: reflect deeply on a subject
cogitate: consider carefully and deeply; reflect upon; turn over in one's mind

Other hyponyms of think over include premeditate, theologise, theologize, introspect, bethink, question, wonder, puzzle, consider, study.

think over (verb)	cogitate (verb)
reflect deeply on a subject	use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments
	consider carefully and deeply; reflect upon; turn over in one's mind