If you want the dictionary definition, just double click on any word.
trainee vs trainer

A trainee is a person who is learning and practising the skills of a particular job.

For example: "There is a shortage of trainee dentists in the UK."

A trainer is a person who teaches skills for a particular job, activity or sport.

For example: "I like to think of myself as an English trainer, not an English teacher."

!Note - The word trainer can also mean sports shoe.