sneer vs smile

sneer and smile both are nouns.

Word	Noun	Adjective	Verb	Adverb
sneer	Yes	No	Yes	No
smile	Yes	No	Yes	No

As verbs, smile is a hypernym of sneer; that is, smile is a word with a broader meaning than sneer:

sneer: smile contemptuously
smile: change one's facial expression by spreading the lips, often to signal pleasure

sneer (noun)	smile (noun)
a facial expression of contempt or scorn; the upper lip curls	a facial expression characterized by turning up the corners of the mouth; usually shows pleasure or amusement
a contemptuous or scornful remark

sneer (verb)	smile (verb)
smile contemptuously	change one's facial expression by spreading the lips, often to signal pleasure
express through a scornful smile	express with a smile