Here's a site for language fans (and nitpickers): the Eggcorn Database. "Eggcorns" are misused words or phrases, like "mute point" for "moot point" or "eggcorn" for "acorn," and this database has collected over 500 of them!
One of them is "ten year" for "tenure." When I was growing up, my father was a tenure-track professor in Math at the University of Toledo. I was always puzzled about the fact that "getting ten year" meant "getting a permanent contract" when it ought to mean "getting a ten-year contract"!