coxa vs articulatio coxae

coxa and articulatio coxae both are nouns.

Word	Noun	Adjective	Verb	Adverb
coxa	Yes	No	No	No
articulatio coxae	Yes	No	No	No

As nouns, coxa and articulatio coxae are synonyms defined as:

coxa and articulatio coxae: the ball-and-socket joint between the head of the femur and the acetabulum

Other synonyms of coxa include hip, hip joint.

coxa (noun)	articulatio coxae (noun)
the ball-and-socket joint between the head of the femur and the acetabulum	the ball-and-socket joint between the head of the femur and the acetabulum