Synonyms|10Antonyms|0|Broader|1Narrower|0Related|0
1
billion of years
1
billions years
1
hundred years
1
hundreds of years
1
million of years
1
million years
1
millions of years
1
scores of years
1
thousands of years
1
thousands years
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APASmart Define. (1970). billions of years thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/billions_of_years/thesaurus/synonyms
ChicagoSmart Define. 1970. "billions of years thesaurus" https://smartdefine.org/billions_of_years/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 1970, billions of years thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/billions_of_years/thesaurus/synonyms>.
MLASmart Define. "billions of years thesaurus" 1 January 1970. Web. 21 September 2026. <https://smartdefine.org/billions_of_years/thesaurus/synonyms>