Private and Second class

Private noun - An enlisted man of the lowest rank in the Army or Marines.

Second class and private are semantically related. In some cases you can use "Second class" instead a noun "Private".

Nearby Words: privation, privately, privacy, privative, privateer

Second class noun - Not the highest quality in a classification.

Private and second class are semantically related. Sometimes you can use "Private" instead a noun phrase "Second class".