ciao vs acknowledgment

ciao and acknowledgment both are nouns.

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

As nouns, acknowledgment is a hypernym of ciao; that is, acknowledgment 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)
acknowledgment: a statement acknowledging something or someone

Other hypernyms of ciao include acknowledgement.

ciao (noun)	acknowledgment (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
	a short note recognizing a source of information or of a quoted passage
	the state or quality of being recognized or acknowledged