back away vs crawfish

back away is not a noun while crawfish is a noun.

Word	Noun	Adjective	Verb	Adverb
back away	No	No	Yes	No
crawfish	Yes	No	Yes	No

As verbs, back away and crawfish are synonyms defined as:

back away and crawfish: make a retreat from an earlier commitment or activity

Other synonyms of back away include back out, crawfish out, pull back, pull in one's horns, retreat, withdraw.

back away (noun)	crawfish (noun)
	large edible marine crustacean having a spiny carapace but lacking the large pincers of true lobsters
	small freshwater decapod crustacean that resembles a lobster
	tiny lobster-like crustaceans usually boiled briefly

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