No how should not be used for anyway.
No place should be written as nowhere.
None should be treated as a singular.
Not, like neither, must be followed by the correlative nor, e. g., "Not for wealth nor for fame did he strive."
Not ... but to express a negative is a double negative and therefore should not be used, e. g., "I have not had but one meal to-day."
Nothing like and nowhere near should not be used for not nearly.
O should be used for the vocative and without punctuation.
Oh should be used for the ejaculation and should be followed by a comma or an exclamation point.
Obligate should not be used for oblige.
Observe should not be used for say.