shoulder blade vs shoulder bone

shoulder blade and shoulder bone both are nouns.

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

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

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

Other synonyms of shoulder blade include scapula.

shoulder blade (noun)	shoulder bone (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