A time that is exactly noon

बारह बजे

English Usage: The meeting is scheduled for twelve noon.

Hindi Usage: मीटिंग बारह बजे निर्धारित है।

The middle of the day, specifically 12 PM

दोपहर

English Usage: She usually takes her lunch at noon.

Hindi Usage: वह आमतौर पर दोपहर में खाना खाती है।