acknowledgement vs message

acknowledgement and message both are nouns.

Word	Noun	Adjective	Verb	Adverb
acknowledgement	Yes	No	No	No
message	Yes	No	Yes	No

As nouns, message is a hypernym of acknowledgement; that is, message is a word with a broader meaning than acknowledgement:

Other hypernyms of acknowledgement include content, subject matter, substance.

acknowledgement (noun)	message (noun)
a statement acknowledging something or someone	content communicating a message; what something is about
the state or quality of being recognized or acknowledged	a communication (usually brief) that is written or spoken or signaled