best wishes vs acknowledgment

best wishes and acknowledgment both are nouns.

Word	Noun	Adjective	Verb	Adverb
best wishes	Yes	No	No	No
acknowledgment	Yes	No	No	No

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

best wishes: an expression of hope for someone's future happiness or welfare.
acknowledgment: a statement acknowledging something or someone

Other hypernyms of best wishes include acknowledgement.

best wishes (noun)	acknowledgment (noun)
an expression of hope for someone's future happiness or welfare.	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