crawdaddy vs decapod

crawdaddy and decapod both are nouns.

Word	Noun	Adjective	Verb	Adverb
crawdaddy	Yes	No	No	No
decapod	Yes	No	No	No

As nouns, decapod is a hypernym of crawdaddy; that is, decapod is a word with a broader meaning than crawdaddy:

crawdaddy: small freshwater decapod crustacean that resembles a lobster
decapod: crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thorax

Other hypernyms of crawdaddy include decapod crustacean.

crawdaddy (noun)	decapod (noun)
small freshwater decapod crustacean that resembles a lobster	crustaceans characteristically having five pairs of locomotor appendages each joined to a segment of the thorax
	cephalopods having eight short tentacles plus two long ones