snappy vs rattling

snappy is not a noun while rattling is a noun.

Word	Noun	Adjective	Verb	Adverb
snappy	No	Yes	No	No
rattling	Yes	Yes	No	Yes

As adjectives, snappy and rattling are synonyms defined as:

Other synonyms of snappy include alert, brisk, lively, merry, spanking, zippy.

snappy (noun)	rattling (noun)
	a rapid series of short loud sounds (as might be heard with a stethoscope in some types of respiratory disorders)

snappy (adjective)	rattling (adjective)
pleasantly cold and invigorating	quick and energetic
quick and energetic	extraordinarily good or great; used especially as intensifiers
marked by up-to-dateness in dress and manners
apt to speak irritably
smart and fashionable

snappy (adverb)	rattling (adverb)
	used to give emphasis