fossa vs glenoid fossa

fossa and glenoid fossa both are nouns.

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

As nouns, glenoid fossa is a hyponym of fossa; that is, glenoid fossa is a word with a more specific, narrower meaning than fossa:

fossa: a concavity in a surface (especially an anatomical depression)
glenoid fossa: the concavity in the head of the scapula that receives the head of the humerus to form the shoulder joint

Other hyponyms of fossa include glenoid cavity, mandibular fossa, epigastric fossa, pit of the stomach.

fossa (noun)	glenoid fossa (noun)
largest carnivore of Madagascar; intermediate in some respects between cats and civets	the concavity in the head of the scapula that receives the head of the humerus to form the shoulder joint
a concavity in a surface (especially an anatomical depression)	a deep concavity in the temporal bone at the root of the zygomatic arch that receives the condyle of the mandible