campaigner

Etymology
From, or.

Noun

 * 1) A person who has served in a military campaign.
 * 2)  A military veteran.
 * 3) A person who campaigns for a person running for political office or works, or supports, in an organised and active way towards a goal; an activist.
 * 4) Someone with experience in a certain field.
 * 1) Someone with experience in a certain field.
 * 1) Someone with experience in a certain field.

Translations

 * German: ,
 * Greek:
 * Maori: kaihāpai
 * Turkish: