He didn't.
He would likely have called it a ὑποτείνουσα ("ypoteinousa"), which means something like "stretching under" (the right angle). However, I don't think he invented the word.
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In a right angle triangle,pythagoras theorem can be used if (1)the 2 sides are equal and their measure is less than the hypotenuse (or) (2)the 2 sides are different and their measure is less than the hypotenuse.
Pythagoras' theorem states that for any right angle triangle its hypotenuse when squared is equal to the sum of its squared sides.
By constructing a right angle triangle whereas its hypotenuse when squared is equal to the sum of its squared sides which is known as Pythagoras' theorem.
Pythagoras was interested in triangles when he found out that for any right angle triangle that when its hypotenuse is squared it is equal to the sum of its two squared sides.
In a right angled triangle its hypotenuse when squared is equal to the sum of its squared sides which is Pythagoras' theorem for a right angle triangle.