substantiate

In transitive terms the difference between sustain and substantiate

is that sustain is to confirm, prove, or corroborate while substantiate is to give material form or substance to something; to embody; to record in documents.

As a noun sustain

is a mechanism which can be used to hold a note, as the right pedal on a piano.

Corrborate is likely misspelled.

Corrborate has no English definition.

As a verb substantiate

is to verify something by supplying evidence; to authenticate or corroborate.

As verbs the difference between illustrate and substantiate

is that illustrate is to shed light upon; to illuminate while substantiate is to verify something by supplying evidence; to authenticate or corroborate.