self-sufficing vs self-sustaining

self-sufficing and self-sustaining both are adjectives.

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

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

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

Other synonyms of self-sufficing include self-sufficient.

self-sufficing (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