crayfish vs crawdad

crayfish and crawdad both are nouns.

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

As nouns, crayfish and crawdad are synonyms defined as:

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

Other synonyms of crayfish include crawdaddy, crawfish.

As nouns, crayfish and crawdad are synonyms defined as:

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

Other synonyms of crayfish include crawfish, ecrevisse.

crayfish (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
warm-water lobsters without claws; those from Australia and South Africa usually marketed as frozen tails; caught also in Florida and California