Helsinki rhymes with:
branki, chunky, clunky, cranky, denki, dinky, donkey, francie, frankie, funky, hankey, hanky, honky, hunky, inky, junkie, junky, kinky, lanky, mcconkey, meincke, monkee, monkey, pankki, panky, pinkie, pinky, postipankki, prinkey, punky, reincke, sankei, sankey, slinky, spunky, stankey, stinky, swanky, twinkie, warncke, warnke, yankee, yankey
Helsinki sounds like:
halcion's, helicons, hellaciousness, hooligans, hulking