Does 'rhythm' have one or two syllables? [duplicate]

Does the word 'rhythm' have one or two syllables?

I'm wondering if there are any reasons for or against a sound-based argument vs a written-based argument.

It may appear from spelling that rhythm has only one syllable, because it has only one vowel. However, the M is a syllabic consonant which forms a syllable of its own. Sonorant consonants like L, M, N, and R can act as the nucleus of a syllable just as a vowel can (although English dictionaries often insert a schwa to represent the nucleus).

It has two syllables. Syllables are entirely features of pronunciation, not of writing, so written-based arguments are irrelevant.