What is the crossword answer for the clue: Letter from Athens

ETA - a 3 letter word may be the answer you are looking for!

PHI - a 3 letter word may be the answer you are looking for!

TAU - a 3 letter word may be the answer you are looking for!

OMEGA - a 5 letter word may be the answer you are looking for!

THETA - a 5 letter word may be the answer you are looking for!

CHI - a 3 letter word may be the answer you are looking for!

Letter from Athens

3 Character Answers:

CHI

ETA

PHI

TAU

5 Character Answers:

OMEGA

THETA