thorn vs thorny

thorn is a noun but thorny is not a noun.

Word	Noun	Adjective	Verb	Adverb
thorn	Yes	No	No	No
thorny	No	Yes	No	No

thorn (noun)	thorny (noun)
something that causes irritation and annoyance
a Germanic character of runic origin
a small sharp-pointed tip resembling a spike on a stem or leaf

thorn (adjective)	thorny (adjective)
	having or covered with protective barbs or quills or spines or thorns or setae etc.
	bristling with perplexities