I have the same question as answered here: Counting syllables in English words
But for rhymes and their metre. When you look for words that rhyme with "castle", does castle still count as two syllables in the metre? I am not sure if this has to do with right pronunciation and/or accents, but it seems to me that the word that sounds almost as if it would have only one syllable cannot fit into a verse that requires two syllable for the correct metre.
How do you count syllables to write nice sounding rhymes?