ma, me, mi, my
Make is a word that means to create and starts with "m".
A four letter word that starts with J and ends with M: jism.
A muscle is a 7 letter word that starts with m and helps you run fast.
A seven (7) letter word that starts with M and ends with O: memento
MeatMateMakeMindMineMintMoodMeekMaleMailMassmast
mademalemanemaskmakemashmathmartmarkmessmeltmeekmeanmealmaremintminemindmilemistmastminkmitemaltmatemoatmissmoonmoodmashmostmolemoltmoremeremeatmeetmustmuskmusemythmothmushmuchmovemoanmademiremacemainmane
mend
measurement
mulch
morons.
magmamajormakermangomangymanormarrymaybemauvemeantmetermessymeritmerrymilkymightminormintyminusmirthmistymitermincemoistmoldymonthmoneymoodymousemoosemotormountmountmouthmossymottomoviemuddymurkymuskymustymutedmazed
Meteorologist! :)