In context|slang|lang=en terms the difference between grip and fist
is that
grip is (slang) as much as one can hold in a hand; a handful while
fist is (slang) to fist-fuck.
As verbs the difference between grip and fist
is that
grip is to take hold of, particularly with the hand while
fist is to break wind or
fist can be to strike with the fist.
As nouns the difference between grip and fist
is that
grip is a hold or way of holding, particularly with the hand or
grip can be (dialectal) a small ditch or trench; a channel to carry off water or other liquid; a drain or
grip can be (obsolete) the griffin while
fist is the act of breaking wind; fise or
fist can be hand with the fingers clenched or curled inward.