Yes, dawn is a noun, and it describes the morning sun rising in the east.
dawn
afternoon
midday
midday
"Meridiem" is a Latin word that translates to "midday" or "noon" in English. It is commonly used in the terms "AM" (ante meridiem, meaning "before midday") and "PM" (post meridiem, meaning "after midday") to denote time before and after noon, respectively.
Noon
One option is "afternoon".
One option is "afternoon".
dawn
No the word "midday" is not hyphenated.
It would be am, as it is in the morning, before midday.
dawn
Daybreak
Dawn
Daybreak, sunrise, sunup.
daybreak
They normally come out at dawn through to about midday.