Perspicacious rhymes with:
efficacious, efficacious, audacious, capacious, ceraceous, crustaceous, efficacious, fallacious, flirtatious, gracious, hellacious, herbaceous, horatius, ignatius, loquacious, mendacious, ostentatious, predaceous, proteinaceous, salacious, sebaceous, spacious, tenacious, vexatious, vivacious, voracious
Perspicacious sounds like:
perceives, periscopes, perkovic, perkovich, precipice, preoccupies, presuppose, presupposes, przybocki, przybysz