chore vs ball-buster

chore and ball-buster both are nouns.

Word	Noun	Adjective	Verb	Adverb
chore	Yes	No	No	No
ball-buster	Yes	No	No	No

As nouns, ball-buster is a hyponym of chore; that is, ball-buster is a word with a more specific, narrower meaning than chore:

chore: a specific piece of work required to be done as a duty or for a specific fee
ball-buster: a job or situation that is demanding and arduous and punishing

Other hyponyms of chore include ball-breaker, stint, scut work, shitwork.

chore (noun)	ball-buster (noun)
a specific piece of work required to be done as a duty or for a specific fee	a job or situation that is demanding and arduous and punishing
	a demanding woman who destroys men's confidence