creepy vs creepy-crawly

creepy is not a noun while creepy-crawly is a noun.

Word	Noun	Adjective	Verb	Adverb
creepy	No	Yes	No	No
creepy-crawly	Yes	Yes	No	No

As adjectives, creepy and creepy-crawly are synonyms defined as:

creepy and creepy-crawly: causing a sensation as of things crawling on your skin

creepy (noun)	creepy-crawly (noun)
	an animal that creeps or crawls (such as worms or spiders or insects)

creepy (adjective)	creepy-crawly (adjective)
causing a sensation as of things crawling on your skin	causing a sensation as of things crawling on your skin
annoying and unpleasant