Conditional formatting - multi-item text list

Hello! I'm working on a spreadsheet with phone numbers for employees and departments. I've been asked to have the department info list in bold.

For example, say I've got entries for:
Accounting
Allen
Carla
Controller

It's easy to use conditional formatting to find and bold one department at a time: Cell value equal to ="Accounting" (I attached a Word file with a screenshot, for your reference.)

How would I adjust the formula to include additional items? We have 20+ departments!

Since this file may be widely distributed, and I'm not sure what security settings the users will have, I'm trying to refrain from using macros.

All help and suggesstions are sincerely appreciated!