mentation vs thought process

mentation and thought process both are nouns.

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

As nouns, mentation and thought process are synonyms defined as:

mentation and thought process: the process of using your mind to consider something carefully

Other synonyms of mentation include cerebration, intellection, thinking, thought.

mentation (noun)	thought process (noun)
the process of using your mind to consider something carefully	the process of using your mind to consider something carefully