acetabulum vs cotyloid cavity

acetabulum and cotyloid cavity both are nouns.

Word	Noun	Adjective	Verb	Adverb
acetabulum	Yes	No	No	No
cotyloid cavity	Yes	No	No	No

As nouns, acetabulum and cotyloid cavity are synonyms defined as:

acetabulum and cotyloid cavity: the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint

acetabulum (noun)	cotyloid cavity (noun)
the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint	the cup-shaped hollow in the hipbone into which the head of the femur fits to form a ball-and-socket joint