there is double letters in the middle of the each word
NOON
It is in the middle of the day!
Noon is one.
Midday
No, "noon" is a common noun. It refers to the time of day when the sun is at its highest point in the sky.
Midnight
NOON
because it's in the middle of the dAy
They both are the beginning of something
antemeridian
it is because if wouldve said afternoon then it wouldve been common aswell if you say the name of a place for example i went to the studio yesterday thats a common but if i say i went to universal studio yesterday thats a proper
predawn pre noon