tendonous synovitis vs tenosynovitis

tendonous synovitis and tenosynovitis both are nouns.

Word	Noun	Adjective	Verb	Adverb
tendonous synovitis	Yes	No	No	No
tenosynovitis	Yes	No	No	No

As nouns, tendonous synovitis and tenosynovitis are synonyms defined as:

tendonous synovitis and tenosynovitis: inflammation of a tendon and its enveloping sheath

Other synonyms of tendonous synovitis include tendosynovitis.

tendonous synovitis (noun)	tenosynovitis (noun)
inflammation of a tendon and its enveloping sheath	inflammation of a tendon and its enveloping sheath