Checkout line and Waiting line

Checkout line noun - A queue of people waiting to pay for purchases.

Waiting line and checkout line are semantically related. In some cases you can use "Waiting line" instead a noun phrase "Checkout line".

Waiting line noun - A line of people or vehicles waiting for something.

Checkout line and waiting line are semantically related. Sometimes you can replace phrase "Checkout line" with "Waiting line", this phrases are similar.