A one syllable word only has one syllable. For examples, consider the differences between these words for syllable counts:
Yes.
"Meant" has one syllable.
The word "meant" has one syllable.
Miss only has one syllable. If you meant the word amiss, it has two syllables.
One.
The word "coy" is one syllable.
Yes the word skull is a one syllable word.
The word bruised only has one syllable. This means the whole word is the syllable and so there are no syllable breaks.
Crumb is a one syllable word.
The word "gum" has one syllable.
The word "dread" has one syllable.
The word "past" has one syllable.
The word "strap" has one syllable.