The crossword solutions for the term ending like -arian are IST (3 letters), EER (3 letters), and ITE (3 letters). IST is an abbreviation for Information Systems Technician, which is a job title for someone who is responsible for the installation, maintenance, and repair of computer systems. EER is an abbreviation for Engineer, which is a job title for someone who designs, builds, and maintains machines, structures, and other items. ITE is an abbreviation for Information Technology Engineer, which is a job title for someone who is responsible for the design, development, and implementation of computer systems.