optic disk vs blind spot

optic disk and blind spot both are nouns.

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

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

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

Other synonyms of optic disk include optic disc.

optic disk (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