crawl space vs crawlspace

crawl space and crawlspace both are nouns.

Word	Noun	Adjective	Verb	Adverb
crawl space	Yes	No	No	No
crawlspace	Yes	No	No	No

As nouns, crawl space and crawlspace are synonyms defined as:

crawl space and crawlspace: low space beneath a floor of a building; gives workers access to wiring or plumbing

crawl space (noun)	crawlspace (noun)
low space beneath a floor of a building; gives workers access to wiring or plumbing	low space beneath a floor of a building; gives workers access to wiring or plumbing