Is 12 pm noon?
Yes, conventionally 12 p.m. is noon, and 12 a.m. is midnight.
You can say “12 p.m. noon” (or just “12 noon”) and “12 a.m. midnight” (or just “12 midnight”) for clarity when making arrangements.
12 noon is the point at which morning ends and afternoon starts.
Bear in mind that the context sometimes determines what time is morning (e.g., 3 a.m may be considered morning for someone starting an early work shift but nighttime for someone who went to bed at 11:30 p.m. and has been woken up by a noisy neighbor).
QuillBot’s free Paraphraser tool can help you find alternative words and phrases for times and parts of the day such as “noon” and “nighttime.”