oat, oaf, ode, off, oft, oho, oil, old, ole, one, ooh, ops, ort, ore, our, out, ova, owe, own
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oats
Osculate and Orgasm
A few examples of 3-letter words starting with the letter O are:owloweoaroatown
ovate ovary ovals
A herb beginning with the letter "o" is oregano.