First class and Sheeplike

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

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

Sheeplike adjective - Like or suggestive of a sheep in docility or stupidity or meekness or timidity.

First class and sheeplike are semantically related. Sometimes you can use "First class" instead an adjective "Sheeplike".