Greeting that becomes another greeting if you add an A at the front and reverse it

HOLA

Think of a warm Spanish hello that can transform into a casual English greeting if you tweak its first letter and flip it backward.

The answer is "HOLA," which is Spanish for "hello." If you add an "A" to the start and reverse the letters, you get "ALOH," which sounds like "aloha"—the Hawaiian greeting. The clue plays on transforming one friendly word into another by tweaking its letters.