35 entries under noun topic. ×

21
age(time, set, informal, round)
14
aeon(set, group, round, age)
11
time
10
era(set, round, period, history)
10
eternity
9
cycle(time, set, age, sequence)
7
epoch
7
generation(age, era)
6
period(set, group, round, age)
6
ages
3
day
3
duration
3
year
2
long
2
years
1
amount
1
annum
1
count
1
lastingness
1
lifetime
<12>
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APASmart Define. (2015). eon thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/eon/thesaurus/synonyms
ChicagoSmart Define. 2015. "eon thesaurus" https://smartdefine.org/eon/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, eon thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/eon/thesaurus/synonyms>.
MLASmart Define. "eon thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/eon/thesaurus/synonyms>