Hyla vs yyizyn

Both of these words mean "a lot of/many" in theory, but in practice they are not used interchangeably

From observations of its use, it is evident that "hyla" is used for continuous groups of data and uncountable items (e.g weight of an object, emotions) whereas "yyizyn" is used for discrete groups of data and countable items (e.g number of leaders in an army, number of elements in the periodic table)