I'm challenging with this question:
Which word is morphologically different from others?
fishy
dirty
pinky (answer)
sneaky
Could anyone, kindly, give me some instruction on why choice 3 is correct?
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Sign up to join this communityIf "pinky" means "the smallest finger or toe", it's really morphologically different, since it's not constructed of two morphemes, root + -y, "pinky" is a borrowing from Dutch pinkje, diminutive of Dutch pink (“little finger”). Note that there's also an alternative spelling of the word, "pinkie".
That question is tricky and allows different answers, for example "pinky" can be considered as meaning "pinkish" and in this case it's constructed of two morphemes, just the same way as the rest of the words in the question, "pink + -y". And yes, the question presupposes the knowledge of the etymology of all those word, or at least access to an etymological dictionary.