optical prism vs optical device

optical prism and optical device both are nouns.

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

As nouns, optical device is a hypernym of optical prism; that is, optical device is a word with a broader meaning than optical prism:

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

optical prism (noun)	optical device (noun)
optical device having a triangular shape and made of glass or quartz; used to deviate a beam or invert an image	a device for producing or controlling light