mediocrity vs worker

mediocrity and worker both are nouns.

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

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

Other hypernyms of mediocrity include actor, doer.

mediocrity (noun)	worker (noun)
ordinariness as a consequence of being average and not outstanding	sterile member of a colony of social insects that forages for food and cares for the larvae
a person of second-rate ability or value	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