-at Words

Riddle: What word doesn't belong in this group? That, hat, what, mat, cat, sat, pat, or chat?

Answer: What. It's pronounced differently; all of the others rhyme.

Source: https://www.riddles.com/168

What word doesn't belong in this group? That, hat, what, mat, cat, sat, pat, or chat? — -at Words by Anonymous v1.

Riddle: What word doesn't belong in this group? That, hat, what, mat, cat, sat, pat, or chat? Answer: What. It's pronounced differently; all of the others rhyme. — by Anonymous v2.