Answer:

zetas

Answer	Crossword Clue
ZETAS	Greek letters
ZETAS	Spartan siesta sounds?
ZETAS	Certain sorority letters

ZETAS	Greek consonants
ZETAS	Letters after epsilons
ZETAS	Epsilon followers
ZETAS	Z's overseas
ZETAS	Sixth letters that look like they should be last
ZETAS	Damping ratio symbols, in engineering
ZETAS	Sorority letters
ZETAS	Letters from Greece

ZETAS	Zorba's snore?
ZETAS	Greek snore?
ZETAS	Epsilons' followers
ZETAS	Frat letters
ZETAS	Zeno's Z's
ZETAS	Greek Z's
ZETAS	Greek Zs
ZETAS	Greek letters.

ZETAS	Letters after epsilons.
ZETAS	Fraternity men.
ZETAS	Greek characters
ZETAS	Particle displacement symbols, in physics
ZETAS	Letters from overseas
ZETAS	Followers of epsilons
ZETAS	Some sorority women
ZETAS	Olympian Z's

ZETAS	Some sisters
ZETAS	Some Greek sisters
ZETAS	Some brothers and sisters
ZETAS	Z Z Z, to Greeks
ZETAS	Some sisters at college
ZETAS	Fraternity letters, sometimes
ZETAS	Letters for Zorba?
ZETAS	Some sorority letters