Hub and Hearts

Hub noun - A thing or place that is of greatest importance to an activity or interest.

Hearts and hub are semantically related In some cases you can replace term "Hearts" with "Hub", this nouns are similar.

Hearts noun - A form of whist in which players avoid winning tricks containing hearts or the queen of spades.

Hub and hearts are semantically related in essence topic. Sometimes you can use "Hub" instead a noun "Hearts".