Fixed costs and Overhead

Fixed costs noun - A periodic charge that does not vary with business volume (as insurance or rent or mortgage payments etc.).

Overhead and fixed costs are semantically related. In some cases you can replace term "Overhead" with "Fixed costs", this terms are similar.

Overhead noun - (nautical) the top surface of an enclosed space on a ship.

Fixed costs and overhead are semantically related. You can use "Fixed costs" instead a noun "Overhead".