Traction

I was enjoying a nice bit of reflexology yesterday, and it occurred to me that "tract" is really very versatile as a root word. You can stick all kinds of prefixes and suffixes on it, and the meanings go all over the place. Consider:

tract-or, -ion
con-tract-or, -ion
pro-tract-or, -ion
ex-tract-or, -ion
de-tract-or, -ion
sub-tract-or, -ion
re-tract-ion

Also, technically, shouldn't addition be called supertraction?