Cool and First class

Cool adjective - Having or showing a lack of friendliness or interest in others.

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

Nearby Words: coolness, coolly, cooler, cooled, cooling

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

Cool and first class are semantically related in excellent topic. Sometimes you can use "Cool" instead an adjective phrase "First class", if it concerns topics such as fine, amazing, most excellent.