Is it possible to change the field name on a form base don the value of another field ?

So I have a drop down where I select the account name and then based on that account name I would like a particular field name to change.

Field deluge is "Reference", can you change the field name

So for account 1 the field name would be "REQ#"

For account 2 the field name would be "TASK#"

Thanks

Matt P