Synoptic rhymes with:
coptic, optic, antiseptic, apocalyptic, coptic, cryptic, ecliptic, epileptic, fiberoptic, optic, peptic, septic, skeptic, triptych
Synoptic sounds like:
snippets, somebody's, sumptuous, symbiotic, sympathetic, sympathies, sympathize, sympathizes, synbiotics, synoptics