Major-league and Upper-class

Upper-class and major-league are semantically related In some cases you can use "Upper-class" instead an adjective phrase "Major-league".

Upper-class adjective - Of high birth, rank, or station.

Major-league and upper-class are semantically related in eminent topic. Sometimes you can use "Major-league" instead an adjective phrase "Upper-class", if it concerns topics such as high-ranking.