oa vowel

Rule Core

oa is a common vowel digraph that usually represents the long vowel /oʊ/, the letter-name sound of o. It most often appears in the middle of words, forming a stable spelling unit as in boat, road, coat.

Articulation Guide

Begin with the tongue positioned mid-back. The lips move from a relaxed opening to a rounded, slightly protruded shape. Airflow is smooth and continuous, with no stop.

Word Analysis

In boat /boʊt/, oa carries the full vowel sound. Road follows the same pattern. By contrast, though is spelled with ough, not oa; its /oʊ/ sound is historical and should not be generalized.

Pitfalls

Do not confuse oa with ow or o-e patterns, and avoid assuming all /oʊ/ sounds are spelled oa.