pterygoid process vs appendage

pterygoid process and appendage both are nouns.

Word	Noun	Adjective	Verb	Adverb
pterygoid process	Yes	No	No	No
appendage	Yes	No	No	No

As nouns, appendage is a hypernym of pterygoid process; that is, appendage is a word with a broader meaning than pterygoid process:

pterygoid process: two bony processes descending from the body of the sphenoid bone
appendage: a natural prolongation or projection from a part of an organism either animal or plant

Other hypernyms of pterygoid process include outgrowth, process.

pterygoid process (noun)	appendage (noun)
two bony processes descending from the body of the sphenoid bone	a part that is joined to something larger
	an external body part that projects from the body
	a natural prolongation or projection from a part of an organism either animal or plant