chain up vs truss

chain up is not a noun while truss is a noun.

Word	Noun	Adjective	Verb	Adverb
chain up	No	No	Yes	No
truss	Yes	No	Yes	No

As verbs, truss is a hypernym of chain up; that is, truss is a word with a broader meaning than chain up:

Other hypernyms of chain up include bind, tie down, tie up.

chain up (noun)	truss (noun)
	a framework of beams (rafters, posts, struts) forming a rigid structure that supports a roof or bridge or other structure
	(medicine) a bandage consisting of a pad and belt; worn to hold a hernia in place by pressure
	(architecture) a triangular bracket of brick or stone (usually of slight extent)

chain up (verb)	truss (verb)
tie up with chains	support structurally
	tie the wings and legs of a bird before cooking it
	secure with or as if with ropes