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Donkey
Did you know that the word "donkey" used to rhyme with "monkey"? If not, you do now, and I hope you feel better for it.
"Donkey" is quite a new word. From Online Etymology:
1785, slang, perhaps from dun "dull grey-brown," the form perhaps infl. by monkey. Or possibly from a familiar form of Duncan (cf. dobbin). The older Eng. word was ass.
For some monkeying around with "asses" see here. For assing around with monkeys see here.