As adjectives the difference between nonconforming and unconventional
is that nonconforming is that does not conform, either to the rules of an established church, or to official regulations while unconventional is not adhering to convention or accepted standards.
As a noun unconventional is
something or someone that is unconventional.
nonconforming
English
Adjective
(-)
That does not conform, either to the rules of an established church, or to official regulations
unconventional
English
Adjective
(
en adjective)
Not adhering to convention or accepted standards
Out of the ordinary
Atypical
Noun
(
en noun)
Something or someone that is unconventional.