JACK AND JILL
From The Enigma
NPL Magazine 
August, 2019
SHRDLU

In the  flat below, the cue words JILL and JACK can be replace by two five-letter words that differ in that their second and fifth letters are switched.

If alpha males should drink their
   coffee black,
Then drinking chocolate JILL would
   not be JACK.

HINTS:
#1: Then drinking chocolate M _ _ _ _ would
      not be M _ _ _ _
#2:Then drinking chocolate MO _ _ _ would
      not be MA _ _ _ .

Answers:

MOCHA
MACHO