farsightedness vs hypermetropy

farsightedness and hypermetropy both are nouns.

Word	Noun	Adjective	Verb	Adverb
farsightedness	Yes	No	No	No
hypermetropy	Yes	No	No	No

As nouns, farsightedness and hypermetropy are synonyms defined as:

farsightedness and hypermetropy: abnormal condition in which vision for distant objects is better than for near objects

Other synonyms of farsightedness include hypermetropia, hyperopia, longsightedness.

As nouns, hypermetropy is a hypernym of farsightedness; that is, hypermetropy is a word with a broader meaning than farsightedness:

farsightedness: a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45
hypermetropy: abnormal condition in which vision for distant objects is better than for near objects

Other hypernyms of farsightedness include farsightedness, hypermetropia, hyperopia, longsightedness.

farsightedness (noun)	hypermetropy (noun)
seeing ahead; knowing in advance; foreseeing	abnormal condition in which vision for distant objects is better than for near objects
abnormal condition in which vision for distant objects is better than for near objects
a reduced ability to focus on near objects caused by loss of elasticity of the crystalline lens after age 45