Word: 
Similar-sounding words in the dictionary:
7 letters:
bat but, cat bit, cat but, cat gut, pact it, pat but, tact it
8 letters:
bach but, back but, dat buck, dock but, gatt but, pack but, tack but, top book, top kick
9 letters:
backed it, backed up, capped it, cocked up, packed it, packed up, popped up, tacked it, tapped it, tock tick, togged up, topped up