Mágnus.
Massive.
Modernize is a word that starts with m and means to upgrade.
Make is a word that means to create and starts with "m".
The phrase 'mais qui' means But who[m]. In the word-by-word translation, the conjuction 'mais' means 'but'. And the conjunction 'qui' means 'who, who[m]'.
magnifico
The word is a monsoon.
massive
A J word for big is JUMBO. Juggernaut.
Thundering is a synonym for the word big.
morrow
The word you are looking for is "clever."
The word is magnificent.
This just means to put the letter in upper case. The word capital here means upper case letters. Capital m is "M." Lowercase m is "m."