sneer vs leer

sneer and leer both are nouns.

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

As nouns, sneer and leer are synonyms defined as:

sneer and leer: a facial expression of contempt or scorn; the upper lip curls

sneer (noun)	leer (noun)
a facial expression of contempt or scorn; the upper lip curls	a suggestive or sneering look or grin
a contemptuous or scornful remark	a facial expression of contempt or scorn; the upper lip curls

sneer (verb)	leer (verb)
smile contemptuously	look suggestively or obliquely; look or gaze with a sly, immodest, or malign expression
express through a scornful smile