Stair and stare are homophones in English and are often confused; they are both pronounced /steəʳ/ but have different spellings and their meanings are completely different.
stair

Stairs is usually a plural noun. Stairs are a set of steps inside a building which go from one floor to another.
Nancy began to climb the stairs.
We walked up a flight of stairs.
You can also say that stair is one of the steps in a flight of stairs.
Terry was sitting on the bottom stair.
stare

Stare is a verb. If you stare at someone or something, you look at them for a long time.
Tamara stared at him in disbelief, shaking her head.
Mahoney tried not to stare.
Ben continued to stare out the window.
Hlasek gave him a long, cold stare.
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