Synonyms for Superlative (same or very similar meaning)
WordNet sense 1 (the highest level or degree attainable; the highest stage of development):
acme, elevation, height, meridian, peak, pinnacle, summit, tiptop, topWordNet sense 2 (highest in quality):
sterling, greatestWordNet sense 3 (of high or superior quality or performance):
superiorFrom the ODE community, based on WordNetadd/edit