Synonyms for Eon:

n.

months, ages, hours, epic, light years. Month Of Sundays, eternity, year, blue moon, long, forever and ever, forever and a day. age (noun)
longevity, lifetime, generation, lastingness, duration, time, epoch, era, oldness, age.
an age (noun)
ages, aeon.
eon (noun)
aeon.
eternity (noun)
study at period, cycle.
time (noun)
aeon.

Other synonyms:

eternity, blue moon. epic. year. long. Other relevant words:
year, forever and a day, eternity, cycle, forever and ever, aeon, Month Of Sundays, hours, ages, epic, months, long, blue moon.