punch bag vs punchball

punch bag and punchball both are nouns.

Word	Noun	Adjective	Verb	Adverb
punch bag	Yes	No	No	No
punchball	Yes	No	No	No

As nouns, punch bag and punchball are synonyms defined as:

punch bag and punchball: an inflated ball or bag that is suspended and punched for training in boxing

Other synonyms of punch bag include punching bag, punching ball.

punch bag (noun)	punchball (noun)
an inflated ball or bag that is suspended and punched for training in boxing	an inflated ball or bag that is suspended and punched for training in boxing