Metroplex rhymes with:
adaptaplex, cineplex, duplex, mediplex, multiplex, simplex, starplex, timeplex, adaptaplex, berlex, cineplex, duplex, mediplex, multiplex, oraflex, simplex, starplex, stratoflex, teleflex, telex, timeplex
Metroplex sounds like:
metroplexes, metropol's, metropolis