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

Question

What word does not belong to the group below? Why?
Earth, CDs, Clock, Venus, DVD, Watch

Answer 1

As the puzzle itslf saying:-

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

So the word what is not belong to this group.