optical prism vs prism

optical prism and prism both are nouns.

Word	Noun	Adjective	Verb	Adverb
optical prism	Yes	No	No	No
prism	Yes	No	No	No

As nouns, optical prism and prism are synonyms defined as:

optical prism and prism: optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image

optical prism (noun)	prism (noun)
optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image	optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image
	a polyhedron with two congruent and parallel faces (the bases) and whose lateral faces are parallelograms