| A | B |
| adversary | person who is against anotyher; opponent; enemy |
| ally | person (or government) that joins with another for a special purpose; helper; supporter; associate |
| creditor | person who is owed money |
| debtor | person who owes something to another |
| defendant | person who is being sued or accused in a court of law |
| plaintiff | person who brings a lawsuit against another |
| optimist | one who is cheerful and expects everthing to turn out all right |
| pessimist | one who expects things to turn out badly |
| predecessor | person who preceded another in a postion or office |
| successor | person who succeeds (follows) another in a position or office |