orthopaedics vs medical science

orthopaedics and medical science both are nouns.

Word	Noun	Adjective	Verb	Adverb
orthopaedics	Yes	No	No	No
medical science	Yes	No	No	No

As nouns, medical science is a hypernym of orthopaedics; that is, medical science is a word with a broader meaning than orthopaedics:

orthopaedics: the branch of medical science concerned with disorders or deformities of the spine and joints
medical science: the science of dealing with the maintenance of health and the prevention and treatment of disease

orthopaedics (noun)	medical science (noun)
the branch of medical science concerned with disorders or deformities of the spine and joints	the science of dealing with the maintenance of health and the prevention and treatment of disease