crayfish vs rock lobster

crayfish and rock lobster both are nouns.

Word	Noun	Adjective	Verb	Adverb
crayfish	Yes	No	No	No
rock lobster	Yes	No	No	No

As nouns, crayfish and rock lobster are synonyms defined as:

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

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

As nouns, crayfish and rock lobster are synonyms defined as:

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

Other synonyms of crayfish include langouste, spiny lobster.

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