crossbeam vs crosspiece

crossbeam and crosspiece both are nouns.

Word	Noun	Adjective	Verb	Adverb
crossbeam	Yes	No	No	No
crosspiece	Yes	No	No	No

As nouns, crossbeam and crosspiece are synonyms defined as:

crossbeam and crosspiece: a horizontal beam that extends across something

Other synonyms of crossbeam include trave, traverse.

crossbeam (noun)	crosspiece (noun)
a horizontal beam that extends across something	a transverse brace
	a horizontal beam that extends across something