schema vs mental representation

schema and mental representation both are nouns.

Word	Noun	Adjective	Verb	Adverb
schema	Yes	No	No	No
mental representation	Yes	No	No	No

As nouns, mental representation is a hypernym of schema; that is, mental representation is a word with a broader meaning than schema:

schema: an internal representation of the world; an organization of concepts and actions that can be revised by new information about the world
mental representation: a presentation to the mind in the form of an idea or image

Other hypernyms of schema include internal representation, representation.

schema (noun)	mental representation (noun)
a schematic or preliminary plan	a presentation to the mind in the form of an idea or image
an internal representation of the world; an organization of concepts and actions that can be revised by new information about the world