-nik-nik /nɪk/ suffix [in nouns] 
someone who is connected with a particular activity or set of beliefs: 
a peacenik (=someone who supports peace)
someone who is connected with a particular activity or set of beliefs: a peacenik (=someone who supports peace)- Age Concern
- aged
- age discrimination
- age group
- ageing
- ageism
- ageist
- ageless
- agelessness
- age limit
- agency
- Agency for International Development
- agenda
- agent
- agent provocateur
- age of consent
- Age of Enlightenment
- Age of Reason
- age-old
- age range
- agflation
- agglomerate
- agglomeration
- agglutination
- aggrandizement