spiralling vs helical

spiralling and helical both are adjectives.

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

As adjectives, spiralling and helical are synonyms defined as:

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

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