vowel teams

Vowel teams are an important part of phonics instruction that help learners understand how two vowels work together to produce a single sound in words. In most cases, when vowels appear as a pair—such as “ai,” “ee,” “oa,” or “ou”—they create either a long vowel sound or a unique blended sound.

https://s3.dualstack.us-west-1.amazonaws.com/speech.pathology/sequence-teaching-vowel-teams.html