Generally, a colleague would be someone who is employed by the same employer as you, though possibly in a completely different role. You could also call this person a 'fellow employee.' A co-worker, however, is normally someone working in the same company and also in a similar role to yourself. Another name for such person is 'workmate.'
An 'associate' is someone who you are associated with at work, possibly in a higher or lower position than yourself.
A colleague = one member of a group of people you work with (pronounced as 'ka-lig')
Co-worker = someone you work with, especially if they are at the same level as you or if they do a similar job as you
Workmate = a person you work with (mate = partner or friend)
A fellow worker = a FELLOW is someone who has the same job, interests or does a similar activity as you...example = fellow player, fellow soldier, fellow student, etc.
An associate = someone you are closely connected with such as a business partner, a friend, etc
A partner, co-partner, collaborator are also used, depending on the situation.
A fellow worker （同僚）
= a FELLOWは、自分と同じ仕事、
例fellow player, fellow soldier, fellow student等
A partner, co-partner, collaborator も使う
Someone I work with
Both of these words are similar and can be used to describe someone you work with. However, you
can also use colleague to describe a fellow student or someone else you may study or spend time
with. Although it is a formal word.
I asked my co-worker to takeover for me when I was away for vacation.
Your colleague/coworker/associate/fellow employee, they all mean basically the same thing; people who work in your workplace and have a similar ranking as you. Maybe one difference is that your co-worker might be someone that you work with directly. However, they are mostly used interchangeably.
Colleague - One of a group of people that work together.
Coworker - a person with whom one works, typically someone in a similar role or at a similar level.
Teammate- A member of a team.
Colleague / Coworker / Teammate are all used interchangeably, and they have very similar meanings.
Colleague usually means that you work for the same employer, for example, the same company.
Coworker usually means someone that works in the same company in a similar role or position.
A Teammate is member of a team belonging to the same. Teammates can be either coworkers or
1. Mr. John and Mr. Smith are colleagues, they both work for Next Generation Company, however, mr. John is a Supervisor, and Mr. Smith is an entry level employee.
2. Ms. Sue and Ms. Maria are both co-workers, they both work in the Sales department as Sales
1. Mr. John and Mr. Smith are colleagues, they both work for Next Generation Company, however, mr. John is a Supervisor, and Mr. Smith is an entry level employee.（JohnさんとSmithさんは同僚で、2人ともNext Generation社に勤めています。ただし、Johnさんはスーパーバイザーで、Smithさんは新入社員です）
2. Ms. Sue and Ms. Maria are both co-workers, they both work in the Sales department as Sales Agents.（SueさんとMariaさんは同僚です。2人とも営業職として営業部で働いています）
"colleague" and "co-worker" mean the same thing. It’s all about preference, some people prefer to say one over the other. "colleague" also sounds a bit more formal.
Both of these words are similar and can be used to describe someone you work with. However, you can also use colleague to describe a fellow student or someone else you may study or spend time with socially.