RhymeHelp.com

an online rhyming dictionary  /raɪm//ˈhɛlp/(/R AY1 M//HH EH1 L P/)

Matched by real pronunciation, not just spelling.

electrocardiogram

/IH2 L EH2 K T R OW0 K AA1 R D IY0 AH0 G R AE2 M/

Near rhymes