10
coexistent(adjective, contemporary, simultaneous)
9
concurrent(adjective, synchronism, simultaneous)
8
synchronous(adjective, synchronism, simultaneous)
7
co-morbid
6
coeval(adjective, synchronism)
6
parallel(adjective, simultaneous)
6
simultaneous(adjective, synchronism)
5
collateral
5
contemporaneous(adjective, contemporary, synchronism)
5
contemporary(adjective, existing, synchronism)
4
coincident(adjective, synchronism)
3
coeternal
3
coinciding
3
concomitant(adjective, synchronism)
3
synchronal
3
synchronic(adjective, synchronism)
3
synchronized
2
accompanying
2
coetaneous(adjective, contemporary, synchronism)
2
coexist
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APASmart Define. (2015). coexisting thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/coexisting/thesaurus/synonyms
ChicagoSmart Define. 2015. "coexisting thesaurus" https://smartdefine.org/coexisting/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, coexisting thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/coexisting/thesaurus/synonyms>.
MLASmart Define. "coexisting thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/coexisting/thesaurus/synonyms>