1
                           general:: 
                            colleague 
someone who you work with in a company or organization, for example someone working in the same office, or someone teaching in the same school: 
• Friends and former colleagues described him as a kind and caring man. • She discovered that her male colleagues were earning more than she was. 
workmate 
British English someone who you work with. Workmate is more informal than colleague: 
• He went out for a drink with his workmates. 
coworker 
American English someone who you work with: 
• I was sad to say goodbye to all of my coworkers. 
associate 
someone who you work with, especially another businessman or businesswoman: 
• They are close friends and business associates. 
staff 
all the people who work for an organization: 
• The company employs a total of 520 staff. • a staff meeting
                        
                        
 
                        
                            Longman-Thesaurus
                        
                        
                    
                    
                        3
                           general:: 
                              noun  ADJ.  close, trusted | junior, senior | female, male | professional, work | academic, business, medical | cabinet, parliamentary
                        
                        
 
                        
                            Oxford Collocations Dictionary