regrets vs acknowledgment

regrets and acknowledgment both are nouns.

Word	Noun	Adjective	Verb	Adverb
regrets	Yes	No	No	No
acknowledgment	Yes	No	No	No

As nouns, acknowledgment is a hypernym of regrets; that is, acknowledgment is a word with a broader meaning than regrets:

Other hypernyms of regrets include acknowledgement, refusal.

regrets (noun)	acknowledgment (noun)
a polite refusal of an invitation	a statement acknowledging something or someone
	a short note recognizing a source of information or of a quoted passage
	the state or quality of being recognized or acknowledged