Word: 
Similar-sounding words in the dictionary:
3 letters:
mum
4 letters:
maam, mimi, mumm, mums
5 letters:
dummy, gummi, gummy, mamie, moami, mommy, money, mucky, muddy, muffy, muggy, mumby, mumma, mumme, mushy, muzzy, rummy, summy, tumey, tummy, yummy
6 letters:
chummy, maumee, moomey, muckey, muzzey, summey, mummey
7 letters:
mummies, mummy's