cranial orbit vs orbital cavity

cranial orbit and orbital cavity both are nouns.

Word	Noun	Adjective	Verb	Adverb
cranial orbit	Yes	No	No	No
orbital cavity	Yes	No	No	No

As nouns, cranial orbit and orbital cavity are synonyms defined as:

cranial orbit and orbital cavity: the bony cavity in the skull containing the eyeball

Other synonyms of cranial orbit include eye socket, orbit.

cranial orbit (noun)	orbital cavity (noun)
the bony cavity in the skull containing the eyeball	the bony cavity in the skull containing the eyeball