The term 'friendly term of address' can refer to a variety of different terms used to address someone in a friendly manner. The three solutions for this term are 'BRO' (3 letters), 'KIDDO' (5 letters), and 'SPORT' (5 letters). 'BRO' is a shortened version of the word 'BROTHER' and is often used between two male friends. 'KIDDO' is a term of endearment used to address a child or young person. Lastly, 'SPORT' is a term used to address someone in a friendly, informal way.