cotyloid vs cotyloidal

cotyloid and cotyloidal both are adjectives.

Word	Noun	Adjective	Verb	Adverb
cotyloid	No	Yes	No	No
cotyloidal	No	Yes	No	No

As adjectives, cotyloid and cotyloidal are synonyms defined as:

cotyloid and cotyloidal: of the cup-shaped socket that receives the head of the thigh bone

Other synonyms of cotyloid include acetabular.

cotyloid (adjective)	cotyloidal (adjective)
of the cup-shaped socket that receives the head of the thigh bone	of the cup-shaped socket that receives the head of the thigh bone