Leo vs doer

Leo and doer both are nouns.

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

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

Other hypernyms of Leo include actor, worker.

Leo (noun)	doer (noun)
the fifth sign of the zodiac; the sun is in this sign from about July 23 to August 22	a person who acts and gets things done
a zodiacal constellation in Northern Hemisphere between Cancer and Virgo
(astrology) a person who is born while the sun is in Leo