Answer:

pentads

Answer	Crossword Clue
PENTADS	Half-decades
PENTADS	Groups of five
PENTADS	The human senses, et al.

PENTADS	Five-year periods
PENTADS	Groups of five.
PENTADS	Five-year periods.
PENTADS	Stalin's economic plans, e.g.
PENTADS	Fivesomes
PENTADS	Quintets

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.