sustenance vs support

sustenance and support both are nouns.

Word	Noun	Adjective	Verb	Adverb
sustenance	Yes	No	No	No
support	Yes	No	Yes	No

As nouns, support is a hypernym of sustenance; that is, support is a word with a broader meaning than sustenance:

sustenance: the act of sustaining life by food or providing a means of subsistence
support: the activity of providing for or maintaining by supplying with money or necessities

As nouns, sustenance and support are synonyms defined as:

Other synonyms of sustenance include bread and butter, keep, livelihood, living.

sustenance (noun)	support (noun)
the act of sustaining life by food or providing a means of subsistence	aiding the cause or policy or interests of
a source of materials to nourish the body	the act of bearing the weight of or strengthening
the financial means whereby one lives	documentary validation
	a military operation (often involving new supplies of men and materiel) to strengthen a military force or aid in the performance of its mission
	the activity of providing for or maintaining by supplying with money or necessities
	any device that bears the weight of another thing
	supporting structure that holds up or provides a foundation
	something providing immaterial assistance to a person or cause or interest
	a musical part (vocal or instrumental) that supports or provides background for other musical parts
	the financial means whereby one lives
	financial resources provided to make some project possible

sustenance (verb)	support (verb)
	establish or strengthen as with new evidence or facts
	put up with something or somebody unpleasant
	adopt as a belief
	argue or speak in defense of
	be a regular customer or client of
	be the physical support of; carry the weight of
	play a subordinate role to (another performer)
	support materially or financially
	give moral or psychological support, aid, or courage to
	be behind; approve of
	support with evidence or authority or make more certain or confirm