crawfish vs crawdad

crawfish and crawdad both are nouns.

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

As nouns, crawfish and crawdad are synonyms defined as:

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

Other synonyms of crawfish include crawdaddy, crayfish.

As nouns, crawfish and crawdad are synonyms defined as:

crawfish and crawdad: tiny lobster-like crustaceans usually boiled briefly

Other synonyms of crawfish include crayfish, ecrevisse.

crawfish (noun)	crawdad (noun)
large edible marine crustacean having a spiny carapace but lacking the large pincers of true lobsters	small freshwater decapod crustacean that resembles a lobster
small freshwater decapod crustacean that resembles a lobster	tiny lobster-like crustaceans usually boiled briefly
tiny lobster-like crustaceans usually boiled briefly

crawfish (verb)	crawdad (verb)
make a retreat from an earlier commitment or activity