prism vs optical prism

prism and optical prism both are nouns.

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

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

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

prism (noun)	optical 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