thought process vs mentation

thought process and mentation both are nouns.

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

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

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

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

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