coonskin cap vs coonskin

coonskin cap and coonskin both are nouns.

Word	Noun	Adjective	Verb	Adverb
coonskin cap	Yes	No	No	No
coonskin	Yes	No	No	No

As nouns, coonskin cap and coonskin are synonyms defined as:

coonskin cap and coonskin: a raccoon cap with the tail hanging down the back

coonskin cap (noun)	coonskin (noun)
a raccoon cap with the tail hanging down the back	a raccoon cap with the tail hanging down the back