rachitis vs rubor

rachitis and rubor both are nouns.

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

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

rachitis: inflammation of the vertebral column
rubor: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of rachitis include inflammation, redness.

rachitis (noun)	rubor (noun)
childhood disease caused by deficiency of vitamin D and sunlight associated with impaired metabolism of calcium and phosphorus	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat
inflammation of the vertebral column