cotyloid joint vs spheroid joint

cotyloid joint and spheroid joint both are nouns.

Word	Noun	Adjective	Verb	Adverb
cotyloid joint	Yes	No	No	No
spheroid joint	Yes	No	No	No

As nouns, cotyloid joint and spheroid joint are synonyms defined as:

cotyloid joint and spheroid joint: a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone

Other synonyms of cotyloid joint include articulatio spheroidea, ball-and-socket joint, enarthrodial joint, enarthrosis.

cotyloid joint (noun)	spheroid joint (noun)
a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone	a freely moving joint in which a sphere on the head of one bone fits into a rounded cavity in the other bone