urarthritis vs arthritis

urarthritis and arthritis both are nouns.

Word	Noun	Adjective	Verb	Adverb
urarthritis	Yes	No	No	No
arthritis	Yes	No	No	No

As nouns, arthritis is a hypernym of urarthritis; that is, arthritis is a word with a broader meaning than urarthritis:

urarthritis: a painful inflammation of the big toe and foot caused by defects in uric acid metabolism resulting in deposits of the acid and its salts in the blood and joints
arthritis: inflammation of a joint or joints

urarthritis (noun)	arthritis (noun)
a painful inflammation of the big toe and foot caused by defects in uric acid metabolism resulting in deposits of the acid and its salts in the blood and joints	inflammation of a joint or joints