crayfish vs crawfish

crayfish and crawfish both are nouns.

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

As nouns, crayfish and crawfish are synonyms defined as:

crayfish and crawfish: large edible marine crustacean having a spiny carapace but lacking the large pincers of true lobsters

Other synonyms of crayfish include langouste, rock lobster, sea crawfish, spiny lobster.

As nouns, crayfish and crawfish are synonyms defined as:

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

Other synonyms of crayfish include crawdad, crawdaddy.

As nouns, crayfish and crawfish are synonyms defined as:

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

Other synonyms of crayfish include crawdad, ecrevisse.

crayfish (noun)	crawfish (noun)
large edible marine crustacean having a spiny carapace but lacking the large pincers of true lobsters	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

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