Boyfriend and Kept woman

Boyfriend noun - A male romantic companion.

Kept woman and boyfriend are semantically related In some cases you can use "Kept woman" instead a noun "Boyfriend".

Kept woman noun - An adulterous woman; a woman who has an ongoing extramarital sexual relationship with a man.

Boyfriend and kept woman are semantically related in lover topic. Sometimes you can use "Boyfriend" instead a noun phrase "Kept woman".