defender
someone who protects
admirer
someone who looks up to someone else
survivor
a person who continues to function in spite of opposition or difficulties
pedestrian
a person who travels on foot
Australian
someone who lives in Australia
inventor
someone who creates some new process, or machine
vocalist
a singer
bicyclist
someone who rides a bicycle
specialist
a person who is devoted to one subject
finalist
a person who makes it into the final contest in a competition
-er
suffix: someone who does
-or
suffix: someone who does
-ian
suffix: someone who does
-ist
suffix: someone who does