[Two Kids' Dad]

#11, the chemist and plumber one. That escapes me. Hint please? Anybody? Beuller?

[SoothingDave]

You get “unionized” for the plumber, right?

Try “un-ionized” for the chemist. Not ionized.

[mountn man]

Plumber thinks in terms of unions, so will say union-ized.

Chemist thinks in terms of chemistry, ie Ions. He'd say un-Ionized.

[Billthedrill]

A plumber would say Yoonyunized, as in being in a union. A chemist would say un-eye-oh-nized, as in not ionized.

[IronJack]

To the plumber, the word reads “yoonyunized.” To the chemist, it’s “un-eye-un-ized.”