swirl vs twirl

swirl and twirl both are nouns.

Word	Noun	Adjective	Verb	Adverb
swirl	Yes	No	Yes	No
twirl	Yes	No	Yes	No

As verbs, swirl and twirl are synonyms defined as:

Other synonyms of swirl include twiddle, whirl.

swirl (noun)	twirl (noun)
the shape of something rotating rapidly	the act of rotating rapidly
	a sharp bend in a line produced when a line having a loop is pulled tight

swirl (verb)	twirl (verb)
flow in a circular current, of liquids	turn in a twisting or spinning motion
turn in a twisting or spinning motion	cause to spin