task vs ball-breaker

task and ball-breaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
task	Yes	No	Yes	No
ball-breaker	Yes	No	No	No

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

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

Other hyponyms of task include ball-buster, stint, scut work, shitwork.

task (noun)	ball-breaker (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
any piece of work that is undertaken or attempted	a demanding woman who destroys men's confidence

task (verb)	ball-breaker (verb)
use to the limit
assign a task to