punch vs jab

punch and jab both are nouns.

Word	Noun	Adjective	Verb	Adverb
punch	Yes	No	Yes	No
jab	Yes	No	Yes	No

As nouns, jab is a hyponym of punch; that is, jab is a word with a more specific, narrower meaning than punch:

punch (noun)	jab (noun)
(boxing) a blow with the fist	a quick short straight punch
a tool for making holes or indentations	a sharp hand gesture (resembling a blow)
an iced mixed drink usually containing alcohol and prepared for multiple servings; normally served in a punch bowl	the act of touching someone suddenly with your finger or elbow

punch (verb)	jab (verb)
deliver a quick blow to	poke or thrust abruptly
make a hole into or between, as for ease of separation	strike or punch with quick and short blows
drive forcibly as if by a punch	stab or pierce