Here is a list of verbs that start with MO.
moan, moaned, moans, mobilize, mobilized
mobilizing, mock, mocked, mocking, model
modeled, modeling, moderates, moderating, modernize
modernized, modernizing, modified, modifies, modify
modifying, modulated, moisten, moistened, moistening
mold, molded, molding, molest, molesting
mollified, mollify, monitored, monitoring, monopolize
mooed, moon, moored, mooring, mop
mopped, mopping, mortared, mortaring, mother
mothered, motioned, motioning, motivate, motivated
motivates, motivating, motor, motoring, mottled
mould, mouldering, mounded, mount, mounted
mounting, mounts, mourn, mourned, mourning
mouthed, mouthing, move, moved, moves
moving, mowed
Hope you enjoy this page of verbs that start with mo and the rest of this verb list site as well.
Did I miss any verbs? Visitors can make this a more useful online resource by listing more verbs in the comments.