Vigilant rhymes with:
fraudulent, ambivalent, benevolent, corpulant, equivalent, excellent, flatulent, fraudulent, indolent, insolent, jubilant, malevolent, nonviolent, opulent, petulant, prevalent, redolent, somnolent, stimulant, truculent, turbulent, violent, virulent
Vigilant sounds like:
vickland, vigeland, vigilante, viglund