Crosspiece and Joist

Crosspiece noun - A horizontal beam that extends across something.

Joist and crosspiece are semantically related. in beam topic. In some cases you can use "Joist" instead a noun "Crosspiece", when it comes to topics like length of material used as support.

Joist noun - Beam used to support a floor or ceiling.

Crosspiece and joist are semantically related. Sometimes you can use "Crosspiece" instead a noun "Joist".