sustain vs nurture

sustain is not a noun while nurture is a noun.

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

As verbs, sustain and nurture are synonyms defined as:

Other synonyms of sustain include nourish.

sustain (noun)	nurture (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

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