constrain vs truss

constrain is not a noun while truss is a noun.

Word	Noun	Adjective	Verb	Adverb
constrain	No	No	Yes	No
truss	Yes	No	Yes	No

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

constrain: to close within bounds, or otherwise limit or deprive of free movement
truss: secure with or as if with ropes

Other hyponyms of constrain include bind, tie down, tie up, fetter, shackle, enchain, pinion, shackle, impound, pound, pound, pound up, fold, pen up, ground.

constrain (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)

constrain (verb)	truss (verb)
severely restrict in scope or extent	support structurally
to close within bounds, or otherwise limit or deprive of free movement	tie the wings and legs of a bird before cooking it
compel to behave in a certain way	secure with or as if with ropes