Heart mainly has one syllable. If you find that it has two, then you're putting too much stress on its pronunciation.
The word "hearts" has one syllable.
The word has three syllables.
The word owner has two syllables. The syllables in the word are own-er.
There are two syllables in the word cupcakes. The syllables in the word are cup-cakes.
The word managed has two syllables. The syllables in the word are man-aged.
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The word 'heart' has one syllable.
Heart is monosyllabic.
The word "hearts" has one syllable.
whole-heart-ed 3 syllables
There are three Chinese syllables in the word "syllables."
The word 'answer' has 2 syllables. An-swer.
There are four syllables in the word "usually".
The syllables in the word what is only 1 : "what".
The word has three syllables.
2 syllables are in the word nuisance. :)