tendosynovitis vs tendonous synovitis

tendosynovitis and tendonous synovitis both are nouns.

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

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

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

Other synonyms of tendosynovitis include tenosynovitis.

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