eyestrain vs weariness

eyestrain and weariness both are nouns.

Word	Noun	Adjective	Verb	Adverb
eyestrain	Yes	No	No	No
weariness	Yes	No	No	No

As nouns, weariness is a hypernym of eyestrain; that is, weariness is a word with a broader meaning than eyestrain:

eyestrain: a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem
weariness: temporary loss of strength and energy resulting from hard physical or mental work

Other hypernyms of eyestrain include fatigue, tiredness.

eyestrain (noun)	weariness (noun)
a tiredness of the eyes caused by prolonged close work by a person with an uncorrected vision problem	temporary loss of strength and energy resulting from hard physical or mental work