According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 1 words with the pattern MO-EM. That is, five letter words with 1st letter M and 2nd letter O and 4th letter E and 5th letter M. In alphabetical order, they are:
modem
Mucho, which is Spanish? Haha. Oh and mango!
alarm
plaza
Rasta
Cream.
Stand
zoned
brant
argot
blitz
Death?
Seven.
taint