naan4 is correct for Yale 難 not nan.Quote
beardan
The book I got the tones from is from 'Interesting Cantonese 2' by Suzanna Ng. It has nan3 not naan4 but the rest of the tones are the same except im using the Yale system.
By the way, just because some sounds in English are close to some sounds in Cantonese (and your examples are really stretching it) does not make the two languages "virtually the same".