jab vs biff

jab and biff both are nouns.

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

As nouns, biff is a hypernym of jab; that is, biff is a word with a broader meaning than jab:

Other hypernyms of jab include clout, lick, poke, punch, slug.

jab (noun)	biff (noun)
a quick short straight punch	(boxing) a blow with the fist
a sharp hand gesture (resembling a blow)
the act of touching someone suddenly with your finger or elbow

jab (verb)	biff (verb)
poke or thrust abruptly	strike, usually with the fist
strike or punch with quick and short blows
stab or pierce