19th letter of Greek alphabet: pl., 4 letters
Characters you sat with, 4 letters
Cross-shaped Greek letters, 4 letters
Cross-shaped letters, 4 letters
Elementary particles, 4 letters
Greek letters after sigmas, 4 letters
Letters from Greece, 4 letters
Particles of the lepton family, 4 letters
Short-lived particles, 4 letters
Some fraternity letters, 4 letters
St. Anthony's crosses, 4 letters
They're cross-shaped, 4 letters
They're crossed in Greece, 4 letters
Vehicle crossword constructor Ben hires to get around labyrinths?, 14 letters