Sn
to snatch = chataf (חטף)
There is 1 syllable.
"Onset" is one word.
It depends on how you're using the word. If you're using it as a verb then yes. As a noun, no.
The puppy is about to snatch the bone away from his sire.
take
Abduct
Grab, Seize
There will be an onset of bugs to the dead carcass.
I was onset walking on a lOng road.
nip?
The onset of winter brought heavy snowfall to the region.