Eightyfold is a rarely used word and there are not many synonyms for it. However, the concept of multiplication and exponential growth can be expressed through other words. Terms like exponential or geometric progression convey the idea of rapid growth. Multiplication by a large factor can be described with words like manifold or exponential. Alternatively, terms like numerous, abundant, and copious can be used to indicate a large quantity or frequency. In certain contexts, phrases like countless, uncountable, or innumerable can be used. The number eighty can also simply be described as "many times more than seven" to convey the same idea.