smiler vs worker

smiler and worker both are nouns.

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

As nouns, worker is a hypernym of smiler; that is, worker is a word with a broader meaning than smiler:

Other hypernyms of smiler include actor, doer.

smiler (noun)	worker (noun)
the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)	sterile member of a colony of social insects that forages for food and cares for the larvae
a person who smiles	a person who works at a specific occupation
	a member of the working class (not necessarily employed)
	a person who acts and gets things done