excogitation vs thought process

excogitation and thought process both are nouns.

Word	Noun	Adjective	Verb	Adverb
excogitation	Yes	No	No	No
thought process	Yes	No	No	No

As nouns, thought process is a hypernym of excogitation; that is, thought process is a word with a broader meaning than excogitation:

excogitation: thinking something out with care in order to achieve complete understanding of it
thought process: the process of using your mind to consider something carefully

Other hypernyms of excogitation include cerebration, intellection, mentation, thinking, thought.

excogitation (noun)	thought process (noun)
thinking something out with care in order to achieve complete understanding of it	the process of using your mind to consider something carefully
the creation of something in the mind