The term 'HAPPY BIRTHDAY WRITERS' can be solved by the five-letter word 'ICERS'. ICERS is an acronym for 'International Council of Editors and Research Services', which is an organization that provides support to writers and editors. The organization was founded in 2006 and offers a variety of services, such as providing resources, networking opportunities, and professional development. They also offer workshops and seminars to help writers and editors hone their skills.