excogitator vs thinker

excogitator and thinker both are nouns.

Word	Noun	Adjective	Verb	Adverb
excogitator	Yes	No	No	No
thinker	Yes	No	No	No

As nouns, thinker is a hypernym of excogitator; that is, thinker is a word with a broader meaning than excogitator:

excogitator: a thinker who considers carefully and thoroughly
thinker: someone who exercises the mind (usually in an effort to reach a decision)

excogitator (noun)	thinker (noun)
a thinker who considers carefully and thoroughly	an important intellectual
	someone who exercises the mind (usually in an effort to reach a decision)