mental imagery vs imagery

mental imagery and imagery both are nouns.

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

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

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

Other synonyms of mental imagery include imagination, imaging.

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