Nouns

(n)slap, smacka blow from a flat object (as an open hand)
(n)smack, smacking, slapthe act of smacking something; a blow delivered with an open hand

Verbs

(v)slaphit with something flat, like a paddle or the open hand“The impatient teacher slapped the student”, “a gunshot slapped him on the forehead”
(v)bump, slapto play music at loud volume

Adverbs

(r)bang, slap, slapdash, smack, boltdirectly“he ran bang into the pole”, “ran slap into her”