body louse vs cootie

body louse and cootie both are nouns.

Word	Noun	Adjective	Verb	Adverb
body louse	Yes	No	No	No
cootie	Yes	No	No	No

As nouns, body louse and cootie are synonyms defined as:

body louse and cootie: a parasitic louse that infests the body of human beings

Other synonyms of body louse include Pediculus corporis.

body louse (noun)	cootie (noun)
a parasitic louse that infests the body of human beings	a parasitic louse that infests the body of human beings