Substantiate for Prove. Why?
Success. "The project was a success." Say, was successful. Success should not have the indefinite article.
Such Another for Another Such. There is illustrious authority for this—in poetry. Poets are a lawless folk, and may do as they please so long as they do please.
Such for So. "He had such weak legs that he could not stand." The absurdity of this is made obvious by changing the form of the statement: "His legs were such weak that he could not stand." If the word is an adverb in the one sentence it is in the other. "He is such a great bore that none can endure him." Say, so great a bore.
Suicide. This is never a verb. "He suicided." Say, He killed himself, or He took his own life. See Commit Suicide.
Supererogation. To supererogate is to overpay, or to do more than duty requires. But the excess must be in the line of duty; merely needless and irrelevant action is not supererogation. The word is not a natural one, at best.
Sure for Surely. "They will come, sure." Slang.
Survive for Live, or Persist. Survival is an outliving, or outlasting of something else. "The custom survives" is wrong, but a custom may survive its utility. Survive is a transitive verb.
Sustain for Incur. "He sustained an injury." "He sustained a broken neck." That means that although his neck was broken he did not yield to the mischance.
Talented for Gifted. These are both past participles, but there was once the verb to gift, whereas there was never the verb "to talent." If Nature did not talent a person the person is not talented.