GC: n
S: http://www.caritasindia.org/index.php/network/collaborators/donors/78-national-news/440-eu-humanitarian-aid-volunteers-launched-to-manage-disasters (last access: 23 August 2016); http://www.ngocentre.org.vn/jobs/volunteers-collaborators (last access: 23 August 2016).
N: 1. 1802, from French collaborateur, from Latin collaboratus, past participle of collaborare “work with,” from com- “with” + labore “to work”.
2. A person who works with another person or group in order to achieve or do something.
A person who helps an enemy who has invaded his or her country during a war.
3. In other fields, co-worker.
S: 1. OED – http://www.etymonline.com/index.php?term=collaborator&allowed_in_frame= (last access: 23 August 2016). 2. http://www.learnersdictionary.com/definition/collaborator (last access: 23 August 2016). 3. LIBRO ROJO/COSNAUTAS (last access: 23 August 2016); FCB.
SYN: helper (depending on context)
S: http://www.worldwidehelpers.org/wwh (last access: 14 October 2012); http://www.trust.org/item/20130816152301-eyzws/ (last access: 3 September 2014).