shoulder bone vs shoulder blade

shoulder bone and shoulder blade both are nouns.

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

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

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

Other synonyms of shoulder bone include scapula.

shoulder bone (noun)	shoulder blade (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