With out has a different meaning to without. It means externally/out-of-doors.

Is it one word or two?

Onto is a preposition, it implies movement, and is more specific that on. On to are two words, and when paired with each other, on acts as a part of a verbal phrase and to acts as a preposition. You can quickly remember the different by saying “up” before on/onto.

The preposition without means ‘not having something’ or ‘lacking something’: I can’t drink tea without milk. I found myself in a strange country, without money and with no one to turn to.

What kind of word is without?

Without can be used in the following ways: as a preposition (followed by a noun): I can’t see without my glasses. (followed by the ‘-ing’ form of a verb): She walked past without saying anything. as an adverb (without a following noun): There isn’t any butter left, so we’ll have to manage without.

w/o – “without”