posthitis vs rubor

posthitis and rubor both are nouns.

Word	Noun	Adjective	Verb	Adverb
posthitis	Yes	No	No	No
rubor	Yes	No	No	No

As nouns, rubor is a hypernym of posthitis; that is, rubor is a word with a broader meaning than posthitis:

posthitis: inflammation of the foreskin of the penis; usually caused by bacterial infection
rubor: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of posthitis include inflammation, redness.

posthitis (noun)	rubor (noun)
inflammation of the foreskin of the penis; usually caused by bacterial infection	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat