hydrarthrosis vs rubor

hydrarthrosis and rubor both are nouns.

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

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

hydrarthrosis: inflammation and swelling of a movable joint because of excess synovial fluid
rubor: a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat

Other hypernyms of hydrarthrosis include inflammation, redness.

hydrarthrosis (noun)	rubor (noun)
inflammation and swelling of a movable joint because of excess synovial fluid	a response of body tissues to injury or irritation; characterized by pain and swelling and redness and heat