pussycat vs worker

pussycat and worker both are nouns.

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

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

Other hypernyms of pussycat include actor, doer.

pussycat (noun)	worker (noun)
informal terms referring to a domestic cat	sterile member of a colony of social insects that forages for food and cares for the larvae
a person who is regarded as easygoing and agreeable	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