shoulder bone vs scapula

shoulder bone and scapula both are nouns.

Word	Noun	Adjective	Verb	Adverb
shoulder bone	Yes	No	No	No
scapula	Yes	No	No	No

As nouns, shoulder bone and scapula are synonyms defined as:

shoulder bone and scapula: either of two flat triangular bones one on each side of the shoulder in human beings

Other synonyms of shoulder bone include shoulder blade.

shoulder bone (noun)	scapula (noun)
either of two flat triangular bones one on each side of the shoulder in human beings	either of two flat triangular bones one on each side of the shoulder in human beings