Coworker vs colleague:
The key difference between colleague and coworker is that the colleague can either refer to someone who is in the same rank or state as you or who work with you while the coworker typically refers to someone with whom you work with.
I unconsciously associated colleagues being of more professional nature, and coworkers at a lower level. For instance teachers or accountants would be colleagues and clerks coworkers. So both are correct in my eyes. when referring to two mechanics at a garage, I would use coworkers.
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. I'd prefer to referred to as Mrs Surname or my first name. 
. We were taught that ‘hopefully’ meant ‘with hope’, not ‘with any luck’, but the meaning has changed now. I also think that it is now acceptable to say ‘different to’ instead of ‘different from’, when it used to be considered American usage (and therefore the work of the Devil, according to my English teacher). Both sound wrong to me, but life moves on.