The term 'FULL AGREEMENT' can be represented by the crossword solution UNISON, which is a six-letter word. UNISON is a trade union in the United Kingdom and Ireland, founded in 1993. It is the largest trade union in the UK, with over 1.3 million members. The union represents workers in a wide range of industries, including health, education, local government, transport, energy, and manufacturing. UNISON's mission is to promote the interests of its members and to ensure that they receive fair pay and working conditions. The union works to ensure that employers adhere to the terms of collective agreements and to protect the rights of its members.