Difference between Mediocre and Second-rate

Mediocre

Part of speech: adjective

Definition: Ordinary: not extraordinary; not special, exceptional, or great; of medium quality;

Example sentence: Mediocre people don't like high achievers, and high achievers don't like mediocre people.

Second-rate

Part of speech: noun

Definition: a British ship-of-the-line sail warship that has 90 to 98 guns dispersed onto 3 gundecks.

Part of speech: adjective

Definition: Of mediocre quality, not first class.