spick vs spick-and-span

spick is a noun but spick-and-span is not a noun.

Word	Noun	Adjective	Verb	Adverb
spick	Yes	Yes	No	No
spick-and-span	No	Yes	No	No

As adjectives, spick and spick-and-span are synonyms defined as:

Other synonyms of spick include immaculate, speckless, spic-and-span, spic, spotless.

spick (noun)	spick-and-span (noun)
(ethnic slur) offensive term for persons of Latin American descent

spick (adjective)	spick-and-span (adjective)
completely neat and clean	completely neat and clean
	conspicuously new