trench Antonyms

knap peninsula projection prominence promontory protrusion protuberance reef ridge papilloma overhang outshoot knur knurl ledge lip mantel marge mesa mountain rock saddleback shoal outcropping sandbank sand bar sandbar gibbousness kopje kyphosis munro coral reef mt tumulus sierra sill skerry tali thalamus top tuberosity tump outthrust jutty aiguille butte cape capsheaf cay choline