Breakthrough and Foremost

Breakthrough noun - An instance of notable progress in the development of knowledge, technology, or skill.

Foremost and breakthrough are semantically related. In some cases you can use "Foremost" instead an adjective "Breakthrough".

Foremost adjective - Coming before all others in importance.

Breakthrough and foremost are semantically related. Sometimes you can use "Breakthrough" instead an adjective "Foremost".