Leo vs worker

Leo and worker both are nouns.

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

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

Other hypernyms of Leo include actor, doer.

Leo (noun)	worker (noun)
the fifth sign of the zodiac; the sun is in this sign from about July 23 to August 22	sterile member of a colony of social insects that forages for food and cares for the larvae
a zodiacal constellation in Northern Hemisphere between Cancer and Virgo	a person who works at a specific occupation
(astrology) a person who is born while the sun is in Leo	a member of the working class (not necessarily employed)
	a person who acts and gets things done