One
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"
At the very least, every English word has at least one syllable.
Crumb is a one syllable word.
Three is a one syllable word. That syllable is sometimes silent.
Elided
My choice of a 3 syllable word to describe science is objective.
ardent
In the word "multiple," the syllable stress is on the first syllable, "mul." Correct syllable stress is very important in speech and can make it very difficult for others to understand if not done correctly.
"Power" is properly pronounced as two syllables 'pow-(e)r, but because the "e" is considerably shortened in speech, it can sound very much like one syllable. Very good question.
Two
In a five-syllable word, the general rule is to accent the second-to-last syllable unless indicated otherwise by the word's origin or pronunciation.
The word 'ding' has one syllable.
1 syllable
One
3 Syllables
Sesquipedalian describes a very, very long word.