Amoeba
A seven (7) letter word that starts with M and ends with O: memento
into
cocoon
Pyro
Juno
to.....
One common exception is the word "mano" (hand), which is feminine even though it ends in -o.
A seven (7) letter word that starts with M and ends with O: memento
overdo
ow
oneodeoreoboeoscillateorangeogreoperateopineobliteratedobdurateobsolete
into
hello :)
JELLO
Quizno
leggo!
cocoon