pushover vs undertaking

pushover and undertaking both are nouns.

Word	Noun	Adjective	Verb	Adverb
pushover	Yes	No	No	No
undertaking	Yes	No	No	No

As nouns, undertaking is a hypernym of pushover; that is, undertaking is a word with a broader meaning than pushover:

Other hypernyms of pushover include labor, labour, project, task.

pushover (noun)	undertaking (noun)
any undertaking that is easy to do	any piece of work that is undertaken or attempted
someone who is easily taken advantage of	the trade of a funeral director