mental process vs cognitive process

mental process and cognitive process both are nouns.

Word	Noun	Adjective	Verb	Adverb
mental process	Yes	No	No	No
cognitive process	Yes	No	No	No

As nouns, mental process and cognitive process are synonyms defined as:

mental process and cognitive process: (psychology) the performance of some composite cognitive activity; an operation that affects mental contents

Other synonyms of mental process include cognitive operation, operation, process.

mental process (noun)	cognitive process (noun)
(psychology) the performance of some composite cognitive activity; an operation that affects mental contents	(psychology) the performance of some composite cognitive activity; an operation that affects mental contents