Clear English - Strange Spelling and Pronunciation Items - Page 5
ck The CK combination mostly gets pronounced as just a K with the C having no voice.
  1. Thus check is pronounced a chek, peck as pek, mock as mok, and others.
Words Ending in AMB, IMB, OMB, and UMB In all of these words the B is silent.
  1. These words include: lamb, jamb, climb, limb, bomb, comb, entomb, tomb, womb, crumb, dumb, plumb, numb, rhumb, thumb, succumb.
  2. Also many of these that also add ER to the end such as dumber, the B is also silent.
  3. However some exceptions to rule 2 above are limber and number where the B is not silent.