French pronunciation of 'bonne'
How do you pronounce 'bonne' as in 'bonne nuit'? Like "bon" or "bon-nuh"?
Indeed it's a single syllable if we don't pronounce the e at the end (unlike the south of france) (the examples I gave were just about the o sound , not the number of syllables). But the o in the two words are not pronouce the same way . In "bonne" you can also hear the n sound at the end that you don't in "bon" . Akudznam_Nafri gives a good explanation.
If your ears are not trained , it can be difficult to hear the difference, but as native speakers , we would hear right away the wrong prononciation ; not that it is a big mistake , but it's better to learn the right pronounciation.