marathon vs task

marathon and task both are nouns.

Word	Noun	Adjective	Verb	Adverb
marathon	Yes	No	No	No
task	Yes	No	Yes	No

As nouns, task is a hypernym of marathon; that is, task is a word with a broader meaning than marathon:

Other hypernyms of marathon include labor, labour, project, undertaking.

marathon (noun)	task (noun)
any long and arduous undertaking	a specific piece of work required to be done as a duty or for a specific fee
a footrace of 26 miles 385 yards	any piece of work that is undertaken or attempted

marathon (verb)	task (verb)
	use to the limit
	assign a task to