Antagonyms.

I don't know what got into me, but I decided to try to determine what to call self-contradicting words, e.g., ravel, cleave, sanction. My wife, Cheryl, and I have enjoyed discussing such words for years. So I went to Google to find out what words have been coined to refer to such words, and it is a mess. Here are the results:

amphibolous/words	539/4
antagonyms	573
antilogies/dust	314/9
auto-antonyms/autoantonyms/combined	43/93/142
contronyms/contranyms/combined	470/216/681
enantiodromes/-dromic/-nymy	3/75/2
janus words	126
self-antonyms	37
self-contradicting words	15

The two front runners appear to be "antagonyms" and "contronyms"/"contranyms". (Amphibolous refers to a grammatical construction that can be interpreted in different ways, hence the large number. "Amphibolous words" has few hits.) So I guess I'll go with antagonyms, since there is no confusion as to spelling (i.e., zero Google hits for "antaganyms").

Here is a list of Web sites with lists or discussions of such words:

http://ccins.camosun.bc.ca/~peterm/venus/contranyms.html
http://www.linguistlist.org/issues/14/14-553.html
http://graphics.csail.mit.edu/%7Eseth/misc/selfantonyms.html
http://users.tinyonline.co.uk/gswithenbank/cntrnmys.htm
http://www-personal.umich.edu/%7Ecellis/antagonym.html
http://thinks.com/words/autoantonyms.htm
http://www.fun-with-words.com/nym_autoantonyms.html
http://www.users.bigpond.com/burnside/contradicting.htm