a·pol·o·gist 
(ə-pŏlə-jĭst)
(ə-pŏlə-jĭst)n.
A person who argues in defense or justification of something, such as a doctrine, policy, or institution.
- discourse
- discourser
- discourteous
- discourteously
- discourteousness
- discourtesy
- discover
- discoverable
- discoverer
- discovery
- discredit
- discreditable
- discreditably
- discreet
- discreetly
- discreetness
- discrepancy
- discrepant
- discrepantly
- discrete
- discretely
- discreteness
- discrete variable
- discretion
- discretional