You can't find anything else that starts with X except for xanthareel, xanthic, xanthippe, xanthocarpous, xanthochroia, or even xanthocyanopsy which is form of colour-blindness in which only blue and yellow can be distinguished.
No Y's until tomorrow, sorry. Please post with an X or sit out today. The choice is yours.
Ooops...not fast enough.
xenografts to keep the X's going is a good way to continue and I like the challenge because I'm learning lots of news words today including xanthocyanopsy, a form of colour-blindness in which only blue and yellow can be distinguished