imagery vs mental imagery

imagery and mental imagery both are nouns.

Word	Noun	Adjective	Verb	Adverb
imagery	Yes	No	No	No
mental imagery	Yes	No	No	No

As nouns, imagery and mental imagery are synonyms defined as:

imagery and mental imagery: the ability to form mental images of things or events

Other synonyms of imagery include imagination, imaging.

imagery (noun)	mental imagery (noun)
the ability to form mental images of things or events	the ability to form mental images of things or events