ecrevisse vs crawdad

ecrevisse and crawdad both are nouns.

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

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

Other hypernyms of ecrevisse include crawdaddy, crawfish, crayfish.

As nouns, ecrevisse and crawdad are synonyms defined as:

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

Other synonyms of ecrevisse include crawfish, crayfish.

ecrevisse (noun)	crawdad (noun)
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