Outermost and Uttermost

Outermost adjective - Most distant from a center.

Uttermost is a synonym for outermost in big topic. In some cases you can use "Uttermost" instead the word "Outermost" as an adjective or an adverb.

Uttermost adjective - Of the greatest or highest degree or quantity.

Outermost is a synonym for uttermost in big topic. You can use "Outermost" instead the word "Uttermost" as an adjective or an adverb, if it concerns topics such as extreme, furthest.