We don't have synonyms for postpunk yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are postpone, post-punk and post punk.
(n) :
Alternative form of post-punk. [(music) A rock music genre that followed punk rock and was more artistic and experimental, laying the foundations for alternative rock.]
(adj) :
Alternative form of post-punk. [After the punk movement.]
(n) :
Alternative form of post-punk. [(music) A rock music genre that followed punk rock and was more artistic and experimental, laying the foundations for alternative rock.]
(adj) :
Alternative form of post-punk. [After the punk movement.]