As adjectives the difference between swirly and twirly
is that swirly is having swirls; swirling while twirly is coiled or curly.
As a noun swirly
is .
swirly
English
Adjective
(er)
Having swirls; swirling.
Noun
(swirlies)
twirly
English
Adjective
(er)
coiled or curly