/ɑ/ — the FATHER vowel as in hot, stop, father

Main spellings (~95%)

⟨o⟩ ~70%

⟨a⟩ ~25%

Regular after /w/ (want, watch, wash). Also in "father."

Unusual spellings (~5%)

⟨ach⟩

⟨au⟩

⟨aw⟩

raw

⟨ough⟩

⟨augh⟩

⟨awe⟩

/ɑ/ vs /ɔ/

Cot-caught merger: Many Americans pronounce /ɑ/ and /ɔ/ the same way. If "cot" and "caught" sound identical to you, that's normal! See the LAW vowel for /ɔ/.