crow's feet vs crow's foot

crow's feet and crow's foot both are nouns.

Word	Noun	Adjective	Verb	Adverb
crow's feet	Yes	No	No	No
crow's foot	Yes	No	No	No

As nouns, crow's feet and crow's foot are synonyms defined as:

crow's feet and crow's foot: a wrinkle in the skin at the outer corner of your eyes

Other synonyms of crow's feet include laugh line.

crow's feet (noun)	crow's foot (noun)
a wrinkle in the skin at the outer corner of your eyes	large tree of Australasia
	a wrinkle in the skin at the outer corner of your eyes