thought vs cogitation

thought and cogitation both are nouns.

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

As nouns, cogitation is a hyponym of thought; that is, cogitation is a word with a more specific, narrower meaning than thought:

thought (noun)	cogitation (noun)
the process of using your mind to consider something carefully	attentive consideration and meditation
the content of cognition; the main thing you are thinking about	a carefully considered thought about something
the organized beliefs of a period or group or individual
a personal belief or judgment that is not founded on proof or certainty