Word: 
Similar-sounding words in the dictionary:
3 letters:
sta, sub, tub
4 letters:
snub, stab, stud, stum, stun, tubb, stub
5 letters:
staab, staib, staub, steeb, steib, strub, stubs, stuck, stuff, stull, stumm, stung, stupp
6 letters:
stobbe, stough, stubbs, stubby, stucke, stuebe
7 letters:
strubbe, stubbed