We don't have synonyms for cyclo-cross yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are cyclo cross and cyclocross.
(n) :
Alternative form of cyclocross. [(cycle racing) A form of bicycle racing consisting of many laps of a short course featuring pavement, wooded trails, grass, steep hills and obstacles and requiring the rider to quickly dismount, carry the bike whilst navigating the obstruction and remount in one motion.]
(n) :
Alternative form of cyclocross. [(cycle racing) A form of bicycle racing consisting of many laps of a short course featuring pavement, wooded trails, grass, steep hills and obstacles and requiring the rider to quickly dismount, carry the bike whilst navigating the obstruction and remount in one motion.]