orthopaedics vs orthopedics

orthopaedics and orthopedics both are nouns.

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

As nouns, orthopaedics and orthopedics are synonyms defined as:

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

orthopaedics (noun)	orthopedics (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