What do the following words have in common?

KIT

CULL

RENDER

CHARGE

HINT:

Each clue can be preceded by the same word - sort of.

Answer:

Each word can be preceded by SIR to make homophones for common words:

SIR KIT - CIRCUIT

SIR CULL - CIRCLE

SIR RENDER - SURRENDER

SIR CHARGE - SURCHARGE