The plural of monkey is monkeys. There are some words ending in 'y' that become 'ies' when plural.

How do you spell more than one monkey?

Why Is There Confusion over the Plural of Monkey? Monkeys is the only way to make the noun monkey plural. Confusion arises because some people mistakenly believe that all nouns ending in "y" should form a plural ending in "ies". When a noun ends with [vowel] + y, you only need to add an "s" to form the plural.

Are there word monkeys?

monkey noun [C] (ANIMAL)

Monkeys are primates (= the group of animals that are most like humans) . What's the difference between an ape and a monkey? In the first question you had to name three types of monkey.