admit vs sustain

admit and sustain both are verbs.

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

As verbs, sustain is a hyponym of admit; that is, sustain is a word with a more specific, narrower meaning than admit:

admit (verb)	sustain (verb)
declare to be true or admit the existence or reality or truth of	undergo (as of injuries and illnesses)
admit into a group or community	establish or strengthen as with new evidence or facts
allow participation in or the right to be part of; permit to exercise the rights, functions, and responsibilities of	admit as valid
allow to enter; grant entry to	supply with necessities and support
give access or entrance to	provide with nourishment
serve as a means of entrance	be the physical support of; carry the weight of
have room for; hold without crowding	lengthen or extend in duration or space
afford possibility