protrusion Antonyms

con-cavity scallop recess pothole notch nook intaglio indention indentation indenting sipe sinus cutout alveolation sinkhole punch bowl cavitied blues trough trench sulcus ichnolite ichnite honeycomb cavity cavern cave bowl basin armpit antrum alveolus alcove collapse concave groove follicle embrasure dint dimple depression dent crenel concavity absorb