Nothing. Fractions don't have highest terms. Numbers don't stop, multiples don't stop.
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If you are talking highest terms as the opposite of simplest form, it is impossible. There's an infinite number of ways to write a fraction, which means this cannot be done.
Fractions that have the same values when reduced to their lowest terms
the highest number that a numerator increased by its GCF
The terms "even" and "odd" are defined for integers, not for fractions.
Knowing the highest common factors of numbers helps to reduce fractions to their lowest terms Factoring helps to find the lowest common multiple of numbers which is useful when adding or subtracting fractions with different denominators.