degenerative joint disease vs osteoarthritis

degenerative joint disease and osteoarthritis both are nouns.

Word	Noun	Adjective	Verb	Adverb
degenerative joint disease	Yes	No	No	No
osteoarthritis	Yes	No	No	No

As nouns, degenerative joint disease and osteoarthritis are synonyms defined as:

degenerative joint disease and osteoarthritis: chronic breakdown of cartilage in the joints; the most common form of arthritis occurring usually after middle age

Other synonyms of degenerative joint disease include degenerative arthritis.

degenerative joint disease (noun)	osteoarthritis (noun)
chronic breakdown of cartilage in the joints; the most common form of arthritis occurring usually after middle age	chronic breakdown of cartilage in the joints; the most common form of arthritis occurring usually after middle age