creepy-crawly vs creepy

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

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

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

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

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

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