spic-and-span vs speckless

spic-and-span and speckless both are adjectives.

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

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

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

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