Boy Scout vs scouter

Boy Scout and scouter both are nouns.

Word	Noun	Adjective	Verb	Adverb
Boy Scout	Yes	No	No	No
scouter	Yes	No	No	No

As nouns, scouter is a hyponym of Boy Scout; that is, scouter is a word with a more specific, narrower meaning than Boy Scout:

Other hyponyms of Boy Scout include Cub Scout, Eagle Scout, rover, Sea Scout.

Boy Scout (noun)	scouter (noun)
a boy who is a member of the Boy Scouts	an adult member of the Boy Scouts movement