tendonous synovitis vs tendosynovitis

tendonous synovitis and tendosynovitis both are nouns.

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

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

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

Other synonyms of tendonous synovitis include tenosynovitis.

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