Please rephrase, I can't work out what you are asking.
multiplacation mental math
Jizz
juxtaposition
decrease
numerator, number, negative
Kilometre , kilogram
Kilogram and Kilometer are math words. They begin with the letter k.
Zero, Zenith, zillion (informal).
Parabola, Parallel, Pi
Monstromologist, Monsters, Manipulation, Math
Whole number is a math term. Weighted average is another math term.
sorry cant think of any but hetry looking in your math textbook golossary