Crab vs actor

Crab and actor both are nouns.

Word	Noun	Adjective	Verb	Adverb
Crab	Yes	No	No	No
actor	Yes	No	No	No

As nouns, actor is a hypernym of Crab; that is, actor is a word with a broader meaning than Crab:

Other hypernyms of Crab include doer, worker.

Crab (noun)	actor (noun)
the fourth sign of the zodiac; the sun is in this sign from about June 21 to July 22	a theatrical performer
(astrology) a person who is born while the sun is in Cancer	a person who acts and gets things done