helical vs volute

helical is not a noun while volute is a noun.

Word	Noun	Adjective	Verb	Adverb
helical	No	Yes	No	No
volute	Yes	Yes	No	No

As adjectives, helical and volute are synonyms defined as:

Other synonyms of helical include coiling, spiral, spiraling, spiralling, turbinate, voluted, whorled.

helical (noun)	volute (noun)
	a structure consisting of something wound in a continuous series of loops
	ornament consisting of a curve on a plane that winds around a center with an increasing distance from the center

helical (adjective)	volute (adjective)
in the shape of a coil	in the shape of a coil