sustain vs truss

sustain is not a noun while truss is a noun.

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

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

Other hyponyms of sustain include scaffold, block, carry, chock, buoy, buoy up, pole, bracket, underpin, prop, prop up, shore, shore up, brace.

sustain (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)

sustain (verb)	truss (verb)
undergo (as of injuries and illnesses)	support structurally
establish or strengthen as with new evidence or facts	tie the wings and legs of a bird before cooking it
admit as valid	secure with or as if with ropes
supply with necessities and support
provide with nourishment
be the physical support of; carry the weight of
lengthen or extend in duration or space