Metropolis rhymes with:
acropolis, necropolis, acropolis, heliopolis, megalopolis, necropolis, papadopoulos, stephanopoulos, stephanopoulos', acropolis, heliopolis, megalopolis, necropolis, papadopoulos, persepolis, stefanopolis, stephanopoulos, stephanopoulos'
Metropolis sounds like:
metroplex, metroplexes, metropol's