nearsightedness vs myopia

nearsightedness and myopia both are nouns.

Word	Noun	Adjective	Verb	Adverb
nearsightedness	Yes	No	No	No
myopia	Yes	No	No	No

As nouns, nearsightedness and myopia are synonyms defined as:

nearsightedness and myopia: (ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred

Other synonyms of nearsightedness include shortsightedness.

nearsightedness (noun)	myopia (noun)
(ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred	(ophthalmology) eyesight abnormality resulting from the eye's faulty refractive ability; distant objects appear blurred