| Main Entry: | |
| Part of Speech: | noun |
| Definition: | sunken or decayed area |
| Synonyms: | armpit, atrium, basin, bursa, caries, chamber, crater, decay, dent, depression, gap, hole, hollow, pit, pocket, sinus, socket, vacuity, void |
| Main Entry: | hollow |
| Part of Speech: | noun |
| Definition: | empty or dented area |
| Synonyms: | basin, bottom, bowl, cave, cavern, cavity, chamber, channel, cleft, concavity, crater, cup, dale, den, depression, dimple, dip, dish, excavation, groove, gulf, hole, indentation, notch, pit, pocket, sag, scoop, sinkage, sinkhole, socket, trough, vacuity, valley, void |
| Antonyms: | solid |
| Main Entry: | |
| Part of Speech: | noun |
| Definition: | cavity, pouch |
| Synonyms: | bag, chamber, compartment, hole, hollow, opening, receptacle, sack, socket |
| Antonyms: | mound, mountain |
| Main Entry: | recess |
| Part of Speech: | noun |
| Definition: | niche, corner |
| Synonyms: | alcove, ambush, angle, apse, bay, break, carrel, cavity, cell, closet, cove, cranny, crutch, crypt, cubicle, dent, depression, depths, embrasure, fork, heart, hiding place, hole, hollow, indentation, mouth, nook, opening, oriel, penetralia, reaches, retreat, secret place, slot, socket |
| Main Entry: | slot |
| Part of Speech: | noun |
| Definition: | opening, place |
| Synonyms: | aperture, channel, cut, groove, hole, niche, position, recess, slit, socket, space, time, vacancy |