As adjectives the difference between punkiest and spunkiest
is that punkiest is superlative of punky while spunkiest is superlative of spunky.
punkiest
English
Adjective
(head)
(punky)
punky
English
Adjective
(er)
(Geology) Of or pertaining to punk (touchwood) - soft or rotted.
Of or pertaining to the punk subculture.
Noun
(punkies)
spunkiest
English
Adjective
(head)
(spunky)
spunky
English
Adjective
(er)
Spirited or plucky.
(UK) Pertaining to or like spunk (semen).
(UK) Stained with semen.