sound editor-they are responsible for all of a film’s sound elements, including dialogue, sound effects, automated dialogue replacement and more. Working in production as the film is being constructed

sound mixer -The sound mixer must decide what elements to emphasize and which to tone down. Working in post production.

Sound Editor: A sound editor is a creative professional responsible for selecting and assembling sound recordings in preparation for the final sound mixing or mastering of a television program, motion picture, video game, or any production involving recorded or synthetic sound. (https://en.wikipedia.org/wiki/Sound_editor_(filmmaking))

Sound Mixer: They visit locations to check for potential sound problems, like passing trains or road noise. During filming, sound mixers ensure audio from radio and boom microphones is recorded at a good level for every take. (https://www.screenskills.com/job-profiles/browse/film-and-tv-drama/technical/sound-mixer/)

A sound mixer works more in production and a sound editor works more in post-production.

Sound editor-

an audio engineer who oversees the production audio crew, mixes and balances the audio as it is recorded, and works to identify and solve the many problems that arise in this field: background noise, echo, distortion. (berklee.edu)

Sound editor oversees what happens to sound during production.

Sound mixer-

creative professional responsible for selecting and assembling sound recordings in preparation for the final sound mixing or mastering of a television program, motion picture, video game, or any production involving recorded or synthetic sound. (wikipedia)

Sound mixers edit the sound into the film. post-production

Sound Editor – someone who collects all the sound that a film requires and puts in other sounds to compliment the spoken words

Sound Mixer – someone who decides which sound elements to emphasize and which to tone down to meld the sounds seamlessly with the recorded dialogue during the post-production

Sound Editor:

Basically, the sound editor is responsible for all of a film’s sound elements, including dialogue, sound effects, automated dialogue replacement and more. It is not until all of these elements are brought together that the sound mixer can get to work.

Sound Mixer:

Once all the different sounds are edited together, the sound mixer comes into play. According to Variety, the sound mixer ultimately determines how an audience hears everything in a film. The sound mixer must decide what elements to emphasize and which to tone down. For example, there may be points in a film where the sound mixer feels the score should reign supreme. At other points, the sound mixer may emphasize the heavy breathing of a protagonist, perhaps during times of extreme stress. 

Info sourced from: https://www.businessinsider.com/oscars-what-is-the-difference-between-sound-mixing-and-sound-editing-2017-2?r=US&IR=T

A sound editor is somebody who puts in sound effects during post production

A sound mixer is somebody who makes sure that there are no sound problems when recording such as car noises during production

Sound editor: The sound editor is the creative genius behind a video production’s selected sound. The final sound assortments play an artful role in calibrating the sound to the visual production. Depending on the scope of the production, some sounds are real-life captured on location. -90seconds.com

Sound mixer: The senior-most sound position during pre-production and production. They serve as a sound recordist during filming, and are responsible for recording and balancing the audio effects on set.-Masterclass.com

A sound editor is a creative professional responsible for selecting and assembling sound recordings in preparation for the final sound mixing or mastering of a television program, motion picture, video game, or any production involving recorded or synthetic sound.

Sound mixers head up the department responsible for all the sound recorded during filming. This is predominantly dialogue but can include sound effects and atmosphere. Before shooting starts, they meet with the producer and director to discuss the best method of capturing sound alongside the director’s shooting style. They visit locations to check for potential sound problems, like passing trains or road noise.  During filming, sound mixers ensure audio from microphones is recorded at a good level for every take. If they flag up a problem, the director decides whether to do another take or correct it in post-production.

SOUND EDITING – Collecting the sounds that are needed for a film. (pre production)

SOUND MIXING – What audio and sound professionals do with those tracks after they are collected. (post production)

Sound editor- One responsible for managing sound tracks and assembling sound recordings in preparation for the final sound mixing (Post-Production)

Sound mixer- Sound mixers ensure that there are no unwanted sounds that are recorded during shoots, and make sure that audio from boom mics are recorded at a good level. (Production)