vowels are a,e,i,o and u.
Some examples are:
apple, apron, adult, agent, acrylic, apostle, arrow, archer, argyle, agar, acorn

elephant, eagle, evening, ear, edelweiss, egg, envelope, enemy, elf, elm

ivory, item, idol, island, isle, igloo, ink, ice, icicle, icon

oven, oval, oblong, ocean, organ, opposite, orange, octopus, olive, offer, oil

umbrella, universe, utensil, university, uniform, union, urchin, udder, utopia