Nearest and Next

Nearest adverb - (superlative of `near' or `close') within the shortest distance.

Next is a synonym for nearest in immediate topic. In some cases you can use "Next" instead an adjective "Nearest", when it comes to topics like forthcoming, nearby. popular alternative

Next adjective - Being the one that comes immediately after another.

Nearest is a synonym for next in time topic. You can use "Nearest" instead an adjective "Next", if it concerns topics such as immediate, adjacent, nearby, closest. popular alternative