tugger vs worker

tugger and worker both are nouns.

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

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

tugger (noun)	worker (noun)
someone who pulls or tugs or drags in an effort to move something	sterile member of a colony of social insects that forages for food and cares for the larvae
	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