cavum vs renal pelvis

Other hyponyms of cavum include blastocele, blastocoel, blastocoele, cleavage cavity, segmentation cavity, archenteron, sinus, locule, loculus, lumen, socket, pulp cavity, cranial orbit, eye socket, orbit, orbital cavity, buccal cavity, antrum, cloaca, vestibule, mediastinum, middle ear, tympanic cavity, tympanum, pleural cavity, chamber, cranial cavity, intracranial cavity, amniotic cavity, greater peritoneal sac, peritoneal cavity, bursa omentalis, lesser peritoneal cavity, omental bursa, pericardial cavity, pericardial space, vacuole, ventricle, sac, uterine cavity, nasal cavity, nasopharynx, oropharynx, laryngopharynx, blind gut, caecum, cecum, tubular cavity, armpit, axilla, axillary cavity, axillary fossa, chest cavity, thoracic cavity, abdomen, abdominal cavity, pelvis, pelvic cavity, celom, celoma, coelom, fossa, pit.