榧 （かや） kaya (Torreya nucifera), Japanese nutmeg tree

榧味噌 （かやみそ） dish of white miso mixed with roasted Japanese nutmeg powder, sugar and sesame seeds, etc.

新かや （しんかや） shin kaya, imitation kaya, any kind of cheaper wood that resembles kaya, used for go and shogi boards

本かや （ほんかや） genuine kaya (as opposed to imitation kaya)