optic disc vs blind spot

optic disc and blind spot both are nouns.

Word	Noun	Adjective	Verb	Adverb
optic disc	Yes	No	No	No
blind spot	Yes	No	No	No

As nouns, optic disc and blind spot are synonyms defined as:

optic disc and blind spot: the point where the optic nerve enters the retina; not sensitive to light

Other synonyms of optic disc include optic disk.

optic disc (noun)	blind spot (noun)
the point where the optic nerve enters the retina; not sensitive to light	the point where the optic nerve enters the retina; not sensitive to light
	a subject about which you are ignorant or prejudiced and fail to exercise good judgment