Diligent and Spark plug

Diligent adjective - Involved in often constant activity.

Spark plug and diligent are semantically related. In some cases you can use "Spark plug" instead an adjective "Diligent".

Nearby Words: diligence, diligently

Spark plug noun - Electrical device that fits into the cylinder head of an internal-combustion engine and ignites the gas by means of an electric spark.

Diligent and spark plug are semantically related. Sometimes you can use "Diligent" instead an adjective phrase "Spark plug".