saimiri

As a noun monkey

is any member of the clade simiiformes not also of the clade hominoidea containing humans and apes, from which they are usually, but not universally, distinguished by smaller size, a tail, and cheek pouches.

As a verb monkey

is (label) to meddle; to mess with; to interfere; to fiddle.

As a proper noun saimiri is

.

As nouns the difference between arboreal and saimiri

is that arboreal is any tree-dwelling creature while saimiri is squirrel monkey.

As an adjective arboreal

is of, relating to, or resembling a tree; treely.