smiler vs smirker

smiler and smirker both are nouns.

Word	Noun	Adjective	Verb	Adverb
smiler	Yes	No	No	No
smirker	Yes	No	No	No

As nouns, smirker is a hyponym of smiler; that is, smirker is a word with a more specific, narrower meaning than smiler:

Other hyponyms of smiler include simperer.

smiler (noun)	smirker (noun)
the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)	a smiler whose smile is offensively self-satisfied
a person who smiles