Heaviness has three syllables. The syllables are heav-i-ness.
The root word for heaviness is "heavy."
The word heaviness is a noun. It is an uncountable noun.
The abstract noun of "heavy" is "heaviness."
The heaviness of the truck tire was too much for me to pick up. The heaviness of the comment was too much to bear.
Height
The object's heaviness was so much that I had to drop it before my arms fell off.
There are three Chinese syllables in the word "syllables."
There are 3 syllables in symphony:sym/pho/ny
there are 2 syllables in stomach. To see why, search 'How many syllables in attack?'
4 syllables am- phi- bi- an
there are 3 syllables
Awake has two syllables. The syllables are a-wake.