STUMPERS CCLXII

The single-syllable word ARE becomes a three-syllable word by adding an A at the end - AREA. Can you think of another single-syllable, three-letter word - also beginning with an A - that changes into a three-syllable word when an A is added at the end? The new word is a proper noun.

HINT:
Opera

Answer:

AID - AIDA

Credit:
Patrick Blindauer