We don't have synonyms for round-trips yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are round trip, round-trip and round trips.
(n) :
Alternative spelling of round trip. [(often figurative, travel) A trip from one destination to another and then returning to the starting location.]
(v) :
Alternative spelling of roundtrip. [(computing, transitive) To export (a file, data, etc.) and eventually import it again without loss of fidelity.]
(n) :
Alternative spelling of round trip. [(often figurative, travel) A trip from one destination to another and then returning to the starting location.]
(v) :
Alternative spelling of roundtrip. [(computing, transitive) To export (a file, data, etc.) and eventually import it again without loss of fidelity.]