Alternatives to coconut flour / flax seed flour?

[EmGee]

I have discovered this great site with a nice looking chocolate chip biscuit recipe livinghealthywithchocolate.com/category/desserts/cookies/
Alas, I have neither coconut flour or flax seed flour - any ideas what I could use to substitute?

Wheat flour (obviously only if gluten isn't an issue) - buckwheat flour, millet flour, rice flour.

I actually used ground almonds and hazelnuts with some GF flour and they tasted nice.