Foremost and Four-star

Foremost adjective - Coming before all others in importance.

Four-star and foremost are semantically related In some cases you can use "Four-star" instead an adjective "Foremost".

Four-star adjective - Of the very best kind.

Foremost and four-star are semantically related in eminent topic. Sometimes you can use "Foremost" instead an adjective phrase "Four-star", if it concerns topics such as high-ranking.