https://en.wikipedia.org/wiki/Syllable
A word that consists of a single syllable (like English dog) is called a monosyllable (and is said to be monosyllabic). Similar terms include disyllable (and disyllabic; also bisyllable and bisyllabic) for a word of two syllables; trisyllable (and trisyllabic) for a word of three syllables; and polysyllable (and polysyllabic), which may refer either to a word of more than three syllables or to any word of more than one syllable.
basically a syllable is any letter with a e u o i
What are multis?
Multi is short for “multi-syllable rhyme.” Multis are strings of phrases in which more than one syllable rhymes Multis can be 2 3, 4 syllable (etc…) rhymes.
Normal rhyme: rat / hat
Multi rhyme blue hat / new rat
they don't have rhyme in the same order and every syllable don't have to rhyme in the phrase
so long as u are rhyming more then one syllable.
rat / hat
this is not a multi because only rat and hat rhyme nothing else rhymes.
blue hat / new the rat 2nd example
this is not a multisyllable rhyme the 2nd example
it's a uneven phrase yeah blue and new rhyme and hat and rat rhyme
but the flow is terrible because one phrase has 2 syllables in it
and the other phrase has 3 syllables in it.
a even phrase and a good rhyme scheme has the same amount of syllables in it and actually rhymes
new rat / blue hat
this is better because the phrase has the same amount of syllables and they both rhyme equally
and rhymes don't have to be perfect u can use similar rhymes aka slant rhyme.