acciaccatura vs appoggiatura

acciaccatura and appoggiatura both are nouns.

Word	Noun	Adjective	Verb	Adverb
acciaccatura	Yes	No	No	No
appoggiatura	Yes	No	No	No

As nouns, acciaccatura and appoggiatura are synonyms defined as:

acciaccatura and appoggiatura: an embellishing note usually written in smaller size

Other synonyms of acciaccatura include grace note.

acciaccatura (noun)	appoggiatura (noun)
an embellishing note usually written in smaller size	an embellishing note usually written in smaller size