Checkout-Check-Out | Commonly Confused Words

Checkout

/ˈtʃekaʊt/

The process of paying for items at a store before leaving

/tʃɛk 'aʊt/

To investigate or try something, or to settle a bill and leave a hotel or any lodging.

Checkout is generally used as a noun or an adjective, often referring to the place or process of paying for goods.
Check out is a phrasal verb and involves the action of looking at something or leaving a location.
You can check out a book from the library, but pay for it at the checkout.
If you want to leave a hotel, you need to check out at the designated time.
Remember, if it involves action, youre likely thinking of check out, while checkout' is more static, referring to a place or process.