truss vs chain up

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

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

As verbs, chain up is a hyponym of truss; that is, chain up is a word with a more specific, narrower meaning than truss:

Other hyponyms of truss include faggot, faggot up, fagot, faggot, fagot, hog-tie.

truss (noun)	chain up (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)

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