Yes, the word "luck" has one syllable.
It has one syllable.
just one syllable
The word "coy" has one syllable.
Yes the word skull is a one syllable word.
There is 1 syllable.
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.
one syllable
one syllable
one syllable
one syllable
no word it isn't possible because if you take away one syllable from a five syllable word you get a four syllable word and there is no such thing as a "no syllable word"