haymaker vs Sunday punch

haymaker and Sunday punch both are nouns.

Word	Noun	Adjective	Verb	Adverb
haymaker	Yes	No	No	No
Sunday punch	Yes	No	No	No

As nouns, haymaker and Sunday punch are synonyms defined as:

haymaker and Sunday punch: a hard punch that renders the opponent unable to continue boxing

Other synonyms of haymaker include knockout punch, KO punch.

haymaker (noun)	Sunday punch (noun)
a hard punch that renders the opponent unable to continue boxing	a hard punch that renders the opponent unable to continue boxing
a farm machine that treats hay to cause more rapid and even drying