ciao vs acknowledgement

ciao and acknowledgement both are nouns.

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

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

ciao: an acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian)
acknowledgement: a statement acknowledging something or someone

Other hypernyms of ciao include acknowledgment.

ciao (noun)	acknowledgement (noun)
an acknowledgment that can be used to say hello or goodbye (aloha is Hawaiian and ciao is Italian)	a statement acknowledging something or someone
	the state or quality of being recognized or acknowledged