self-sufficient vs self-sustaining

self-sufficient and self-sustaining both are adjectives.

Word	Noun	Adjective	Verb	Adverb
self-sufficient	No	Yes	No	No
self-sustaining	No	Yes	No	No

As adjectives, self-sufficient and self-sustaining are synonyms defined as:

self-sufficient and self-sustaining: able to provide for your own needs without help from others

Other synonyms of self-sufficient include self-sufficing.

self-sufficient (adjective)	self-sustaining (adjective)
able to provide for your own needs without help from others	able to provide for your own needs without help from others