Here is a list of verbs that start with MAR.
mar, marbleized, marbleizing, march, marched
marches, marching, marinated, marinating, mark
marked, marketed, marketing, markets, marking
marks, marooned, marred, married, marries
marring, marry, marrying, mars, marshal
marshaling, marshalled, marshalling, marvel, marveled
marvelled, maryed
Hope you enjoy this page of verbs that start with mar 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.