Since the word heart has only one syllable, the concept of an accented syllable does not apply. You can only accent a syllable by giving it a greater emphasis than some other syllable or syllables in the same word, which means that you have to have at least two syllables.
Yes the word common has an accented syllable. Common is accented on the first syllable.
Certain . First accented syllable.
The first syllable of "chamber" is accented.
The accented syllable in the word "arteriolitis" is "te".
The accented syllable of the word "arteriosclerosis" is "scler."
The accented syllable in the word "above" is "a-" as in "a-bove".
The accented syllable in the word "thousands" is "sand."
The first.
Fountain is accented on the first syllable.
Except is accented on the second syllable.
Remind is accented on the second syllable.
The word merchant is a second accented syllable word.