pneumonia
pseudonym
psychiatrist
psalm
...
corps
coup
cupboard
raspberry
receipt

debt /dɛt/
doubt /dawt/
...
crumb /kr^m/
dumb /d^m/
numb /n^m/
thumb /th^m/
...
plumber /pl^mər/
tomb /tuwm/
lamb /laem/
climb /klaym/
bomb /bam/
comb /kowm/

When is mb pronounced?