noun
1
BAD : That afternoon my fellows and I were at a swimming pool where there was a party going on.
GOOD : That afternoon my friends and I were at a swimming pool where there was a party going on.
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fellow = (informal) a man or person: 'The new manager seems a pleasant enough sort of fellow.'
your fellow students / workers = the people that you study or work with: 'I soon got to know my fellow students and made one or two good friends.'
friend = a person that you like and enjoy being with: 'I'm having lunch with a friend of mine.'
2
BAD : My boss started to shout at me in front of all my fellows.
GOOD : My boss started to shout at me in front of all my workmates.
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To refer to someone you know because you work at the same place, use workmate or (especially of people in professional jobs) colleague : 'The police are questioning the missing woman's relatives and workmates.'
'I 'd like you to meet a colleague of mine, Jean Armstrong.'