Twofer

That's today's Brain Bender, anyway. Ready to play??

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Find the word that fits the definitions below when it's 1) a whole word and 2) divided into two words.

1) Whole word: make better

2) Two words:
a. mischievous elf
b. wander

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Okay, you know what to do. The answers will be found later in the comments.

Me? I am off to stand in line for an indeterminate amount of time at the post office.... Gah....