crawfish vs ecrevisse

crawfish and ecrevisse both are nouns.

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

As nouns, ecrevisse is a hyponym of crawfish; that is, ecrevisse is a word with a more specific, narrower meaning than crawfish:

Other hyponyms of crawfish include Old World crayfish, American crayfish.

As nouns, crawfish and ecrevisse are synonyms defined as:

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

Other synonyms of crawfish include crawdad, crayfish.

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

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