Pang and Regrets

Pang noun - A sharp unpleasant sensation usually felt in some specific part of the body.

Regrets and pang are semantically related In some cases you can replace term "Regrets" with "Pang", this nouns are similar.

Regrets noun - A polite refusal of an invitation.

Pang and regrets are semantically related in upset over past action topic. Sometimes you can use "Pang" instead a noun "Regrets".