Class and First class

Class noun - One of the segments of society into which people are grouped.

First class and class are semantically related. In some cases you can use "First class" instead an adjective "Class".

Nearby Words: classify, classification, classical, classed, classmate

First class noun - Mail that includes letters and postcards and packages sealed against inspection.

Class and first class are semantically related. Sometimes you can use "Class" instead an adjective phrase "First class".