shoulder bone vs glenoid fossa

shoulder bone and glenoid fossa both are nouns.

Word	Noun	Adjective	Verb	Adverb
shoulder bone	Yes	No	No	No
glenoid fossa	Yes	No	No	No

shoulder bone (noun)	glenoid fossa (noun)
either of two flat triangular bones one on each side of the shoulder in human beings	the concavity in the head of the scapula that receives the head of the humerus to form the shoulder joint
	a deep concavity in the temporal bone at the root of the zygomatic arch that receives the condyle of the mandible