RhymeHelp.com

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

Matched by real pronunciation, not just spelling.

nitrocellulose

/N AY2 T R OW0 S EH1 L Y AH0 L OW2 S/

Perfect rhymes

3 syllables

Near rhymes