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Answer for the clue "Groups of four, and what's spelled out by the groups of four in this puzzle's theme answers ", 7 letters:
tetrads

Alternative clues for the word tetrads

Word definitions for tetrads in dictionaries

Wiktionary Word definitions in Wiktionary
n. (plural of tetrad English)

Usage examples of tetrads.

But since qinks only flew the mating dance in tetrads, two of them were always keeping an eye on the sky ahead at all times.