ecrevisse vs crawfish

ecrevisse and crawfish both are nouns.

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

As nouns, crawfish is a hypernym of ecrevisse; that is, crawfish is a word with a broader meaning than ecrevisse:

Other hypernyms of ecrevisse include crawdad, crawdaddy, crayfish.

As nouns, ecrevisse and crawfish are synonyms defined as:

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

Other synonyms of ecrevisse include crawdad, crayfish.

ecrevisse (noun)	crawfish (noun)
small crayfish of Europe and Asia and western North America	large edible marine crustacean having a spiny carapace but lacking the large pincers of true lobsters
tiny lobster-like crustaceans usually boiled briefly	small freshwater decapod crustacean that resembles a lobster
	tiny lobster-like crustaceans usually boiled briefly

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