crawdaddy vs crawdad

crawdaddy and crawdad both are nouns.

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

As nouns, crawdaddy and crawdad are synonyms defined as:

crawdaddy and crawdad: small freshwater decapod crustacean that resembles a lobster

Other synonyms of crawdaddy include crawfish, crayfish.

crawdaddy (noun)	crawdad (noun)
small freshwater decapod crustacean that resembles a lobster	small freshwater decapod crustacean that resembles a lobster
	tiny lobster-like crustaceans usually boiled briefly