shin splints vs redness

shin splints and redness both are nouns.

Word	Noun	Adjective	Verb	Adverb
shin splints	Yes	No	No	No
redness	Yes	No	No	No

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

shin splints: painful inflammation of the muscles around the shins; frequent among runners
redness: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of shin splints include inflammation, rubor.

shin splints (noun)	redness (noun)
painful inflammation of the muscles around the shins; frequent among runners	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