keratoiritis vs redness

keratoiritis and redness both are nouns.

Word	Noun	Adjective	Verb	Adverb
keratoiritis	Yes	No	No	No
redness	Yes	No	No	No

As nouns, redness is a hypernym of keratoiritis; that is, redness is a word with a broader meaning than keratoiritis:

keratoiritis: inflammation of the cornea and the iris of the eye
redness: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of keratoiritis include inflammation, rubor.

keratoiritis (noun)	redness (noun)
inflammation of the cornea and the iris of the eye	red color or pigment; the chromatic color resembling the hue of blood
	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat