Mosquito.
Likely candidate is the word: Inform.
myth
Merry is a synonym for happy. It begins with the letter m.
You gave 7 letters and asked for a six letter word. I'll assume you meant a seven letter word. I could make the word 'amusing' with the letters you gave.
impel
Some five letter words with O and M as the second and third letter are:combocometcommacomicdomedhomerhomeymommynomadoomphromanromeorompervomitwomanwomen
Tempo -
M-V--MavenMovedMoverMovesMovie
blame
magmamajormakermangomangymanormarrymaybemauvemeantmetermessymeritmerrymilkymightminormintyminusmirthmistymitermincemoistmoldymonthmoneymoodymousemoosemotormountmountmouthmossymottomoviemuddymurkymuskymustymutedmazed
major
Mogul.
moxie
Macau
dmksp.
scamps