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This puzzle is based on the "connecting wall" from the British tv show "Only Connect". The goal is to group the 16 words into 4 groups of 4 words that all share a property. Here are the words:

MIX LASER RACECAR EMPTY
SONAR SCUBA NOON VIM
MOSSY KAYAK LIVID BOOST
CIVIL ROTATOR CAPTCHA BIOPSY

What are the four groups of words? What is the connection between the words in each group?

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Group 1:

ACRONYM words, containing SONAR, LASER, CAPTCHA, SCUBA.

Group 2:

ROMAN NUMERAL words, containing CIVIL, MIX, LIVID, VIM.

Group 3:

PALINDROMIC words, containing NOON, RACECAR, KAYAK, ROTATOR.

Group 4:

ALPHABETICAL ORDER words, containing MOSSY, EMPTY, BOOST, BIOPSY.

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    $\begingroup$ Just ahead of me, the last group is rot13(jbeqf gung ner va nycunorgvpny beqre) $\endgroup$
    – hexomino
    May 16 at 18:11
  • $\begingroup$ Your groupings are correct. $\endgroup$
    – user197974
    May 16 at 18:15
  • $\begingroup$ @user197974 Finished it off. Thanks to hexomino for the Group 4 connection! $\endgroup$ May 16 at 20:40
  • 4
    $\begingroup$ Happy 1,000th answer! $\endgroup$ May 17 at 6:31

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