Another word for in front is, obverse.
order
You might be thinking of the word 'omit' or 'omitted'.
Other Words in place of a Weird-o: An Oddity An Eccentric A Crazy
Bold
You might want to think how it could be if you think of what it is. Like the texture and everything. It is just a suggestion.
another word for chasm that begins with o omission opening oversight
Oasis
offence
originonset
obi
order
You might be thinking of the word 'omit' or 'omitted'.
One "wow"word (or phrase) beginning with O is "Oh my goodness!" Another = "Oh Wow!"
The word you are looking for is probably - legerdemain. Another synonym for sleight of hand is - Prestidigitation.
Ostrich!
sandcastle
Occult