speckless vs spick-and-span

speckless and spick-and-span both are adjectives.

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

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

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

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