Word: 
Similar-sounding words in the dictionary:
6 letters:
culpon, culton, dirdum, gulden, kirpan, kurgan, pyrgom, tergum, terpin
7 letters:
bourdon, bulb in, bulk in, cult in, dirking, gulp in, pulp in
8 letters:
culpa in, durga in
9 letters:
bourgogne, culled in, dulled in, pulque in, purdah in
11 letters:
bull tongue