smack vs slap

smack and slap both are nouns.

Word	Noun	Adjective	Verb	Adverb
smack	Yes	No	Yes	Yes
slap	Yes	No	Yes	Yes

As nouns, smack and slap are synonyms defined as:

smack and slap: the act of smacking something; a blow delivered with an open hand

Other synonyms of smack include smacking.

As nouns, smack and slap are synonyms defined as:

As adverbs, smack and slap are synonyms defined as:

Other synonyms of smack include bang, bolt, slapdash.

smack (noun)	slap (noun)
the act of smacking something; a blow delivered with an open hand	the act of smacking something; a blow delivered with an open hand
an enthusiastic kiss	a blow from a flat object (as an open hand)
street names for heroin
a sailing ship (usually rigged like a sloop or cutter) used in fishing and sailing along the coast
the taste experience when a savoury condiment is taken into the mouth
a blow from a flat object (as an open hand)

smack (verb)	slap (verb)
press (the lips) together and open (the lips) noisily, as in eating	hit with something flat, like a paddle or the open hand
kiss lightly	to play music at loud volume
deliver a hard blow to
have a distinctive or characteristic taste
have an element suggestive (of something)

smack (adverb)	slap (adverb)
directly	directly