nurture vs sustain

nurture is a noun but sustain is not a noun.

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

As verbs, nurture and sustain are synonyms defined as:

Other synonyms of nurture include nourish.

nurture (noun)	sustain (noun)
helping someone grow up to be an accepted member of the community
the properties acquired as a consequence of the way you were treated as a child

nurture (verb)	sustain (verb)
help develop, help grow	undergo (as of injuries and illnesses)
provide with nourishment	establish or strengthen as with new evidence or facts
look after a child until it is an adult	admit as valid
	supply with necessities and support
	provide with nourishment
	be the physical support of; carry the weight of
	lengthen or extend in duration or space