orthopedics vs orthopaedics

orthopedics and orthopaedics both are nouns.

Word	Noun	Adjective	Verb	Adverb
orthopedics	Yes	No	No	No
orthopaedics	Yes	No	No	No

As nouns, orthopedics and orthopaedics are synonyms defined as:

orthopedics and orthopaedics: the branch of medical science concerned with disorders or deformities of the spine and joints

orthopedics (noun)	orthopaedics (noun)
the branch of medical science concerned with disorders or deformities of the spine and joints	the branch of medical science concerned with disorders or deformities of the spine and joints