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"hello" is also used as a crossword clue. If that's what you saw, the answer is often hi (2 letters).
Definitions
an expression of greeting
Word origin
Hello (first attested in 1826), from holla, hollo (attested 1588). This variant of hallo is often credited to Thomas Edison as a coinage for telephone use, but its appearance in print predates the invention of the telephone by several decades.
Used in a sentence
“Hello, everyone.”
“Hello? How may I help you?”
“Hello. This is Marsha. ― Yes, Marsha.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Greeting word”5 letters
02“Common greeting”5 letters
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