duck soup vs pushover

duck soup and pushover both are nouns.

Word	Noun	Adjective	Verb	Adverb
duck soup	Yes	No	No	No
pushover	Yes	No	No	No

As nouns, duck soup and pushover are synonyms defined as:

Other synonyms of duck soup include breeze, child's play, cinch, picnic, piece of cake, snap, walkover.

duck soup (noun)	pushover (noun)
any undertaking that is easy to do	any undertaking that is easy to do
	someone who is easily taken advantage of