coworker

As nouns the difference between coworker and collaborator

is that coworker is somebody with whom one works; a companion or workmate while collaborator is a person who works with others towards a common goal.

As nouns the difference between coworker and associate

is that coworker is somebody with whom one works; a companion or workmate while associate is a person united with another or others in an act, enterprise, or business; a partner or colleague.

As an adjective associate is

joined with another or others and having equal or nearly equal status.

As a verb associate is

to join in or form a league, union, or association.

As nouns the difference between college and coworker

is that college is a corporate group; a group of colleagues while coworker is somebody with whom one works; a companion or workmate.