A short list of words commonly misused.
http://www.pnl.gov/ag/usage/confuse.html

I found one I have misused.
ku[dos 7ky14d9s#, k1$3; also, 3dbs#8
n.
5Gr kydos, glory, fame IE *kud3 base *keu3, to pay attention to, HEAR6 credit or praise for an achievement; glory; fame: sometimes wrongly taken as a plural (pron. 3dbz) of an assumed “kudo”

My only excuse is that I have only seen it used incorrectly.