Is book bag one word or two?

Answer 1

Backpack is only one word :)

Answer 2

If you were to type "bookbag" (one word) into most computers with Spell Check on, it would catch it, and in most - but not all - dictionaries it is listed as two words.

However, because the English language is so complex and is constantly changing, it would normally be perfectly acceptable to write bookbag as one word in this day and time. Everyone would understand exactly what you meant and I can not see any copyeditors (<-- there's another debatable word) throwing a fit over it.

As far as most people are concerned, "bookbag", "book-bag", and "book bag" can all be considered correct and entirely interchangeable.

A good rule of thumb would be that if you do not feel the absolute need to hyphenate or space out a compound word, you probably don't need to. This is how new words are created and/or modernized in the English language after all.

Answer 3

These days, it is one: Notebook. It hasn't always been that way, though.

Answer 4

Sketch book

Answer 5

One.

Answer 6

2 words