I think we have danger and adventure.  There’s something biblical and epic-proportioned about “gnash”.

• 04.033 and all his soldiers gnashed their teeth, clashed their shields,
• 04.034 “Slash them! Beat them! Bite them! Gnash them!
• 06.082 and gnashed their teeth;

“gnash, v.” OED Online. Oxford University Press, March 2015. Web. 29 May 2015.

“† gnast, v.” OED Online. Oxford University Press, March 2015. Web. 29 May 2015.