Mates
A four letter word that starts with J and ends with M: jism.
methionylglutaminylarginyltyrosylglutamylseryllleucylpheny
A seven (7) letter word that starts with M and ends with O: memento
The word is magnificent.
mess
meander
major
matriarch, meaning female head of the family.
Actually, it starts and ends with "M", but you remove the first "M" and insert an "O" ANYWHERE in the word, not just replace "M" with "O"
Modernize is a word that starts with m and means to upgrade.
Make is a word that means to create and starts with "m".
Marvelous Or Modelesque (urban dictionary) Meaning having the look of a model.
Chum
Massasoit
my
mother, morning, modest, meaning, maize, mom, multiplication
A four letter word that starts with J and ends with M: jism.