mental test vs mental testing

mental test and mental testing both are nouns.

Word	Noun	Adjective	Verb	Adverb
mental test	Yes	No	No	No
mental testing	Yes	No	No	No

As nouns, mental test and mental testing are synonyms defined as:

mental test and mental testing: any standardized procedure for measuring sensitivity or memory or intelligence or aptitude or personality etc

Other synonyms of mental test include psychometric test, test.

mental test (noun)	mental testing (noun)
any standardized procedure for measuring sensitivity or memory or intelligence or aptitude or personality etc	any standardized procedure for measuring sensitivity or memory or intelligence or aptitude or personality etc