We don't have synonyms for quarter pipe yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are quarterpipe, quarter mile and quarter vine.
(n) :
Alternative form of quarter-pipe. [(skateboarding, snowboarding, skiing, BMX, rollerskating) A structure used to perform tricks, approximately half the size of a half-pipe, similar in appearance to having a quarter of a circle in cross-section, with the middle of that quarter as the bottom.]
(n) :
Alternative form of quarter-pipe. [(skateboarding, snowboarding, skiing, BMX, rollerskating) A structure used to perform tricks, approximately half the size of a half-pipe, similar in appearance to having a quarter of a circle in cross-section, with the middle of that quarter as the bottom.]