y-axis
I would say no there arent any words that start with the letter x sorry :(. Sucks dosent it
Ohio
Ominous
unique
Auto
kilometers
Frequency.
Hypotenuse, hexagon
universal graph, uranium, umbra
The Greek letter Kappa (κ) is sometimes used in math. For example, in differential geometry, the curvature of a curve is given by κ.
vector
hypotenuse
Geometry
linear
Quadratic, quotient.
integers?
hypotenuse, hexagon, half, hectometre, hectogram (etc), Hamiltonian, hyperbola, hyperbolic, hypergeometric are some.