The twenty related words are all monetary units.
In the grid added at the right, a vertical line means that the letter is used in a vertical word, a hyphen menas that the letter is used in a horizontal word, and a period means that the letter is unused.
B D D Y K I M E P R . | - | | - - - | | Z A D U L O R C T Y - . | | - - | | - - P O E K R R S O O I - | - . | | - | - | C L C Y E A N L E A | | . - - | - | | | D L R A O C U H M A - | - - | - | - - - E P I O U N N D N L | - | - - | - - | | M A N A R E P O C K - | | - - . | | | - L R I A N D N N R A - | - | | | . | - - N R A N A U E B L E | - | | | - | - - - T F R R A N E D E C | - | - - - | . | -
The unused letters, when read from left to right, give
back end, so BACK and END are a solution pair.