Aside and Abreast

Aside adverb - On or to one side.

Abreast and aside are semantically related in position topic. In some cases you can use "Abreast" instead an adverb "Aside", when it comes to topics like to one side, away from.

Abreast adverb - Alongside each other, facing in the same direction.

Aside and abreast are semantically related in position topic. You can use "Aside" instead an adverb "Abreast", if it concerns topics such as to one side.