Can anyone provide me with a list of English words that are their own antonyms? [closed]

I think you're referring to Auto-antonyms. They are not the same word but a homograph (a word of the same spelling) that is also an antonym. I guess, Janus word is also acceptable.

There was a list on Wikipedia (List of Auto-antonyms in English), since moved to Wiktionary's Appendix of English contranyms.

There are several names for these. "Contradictanym" is one you see in a few places. There's another list of several examples here: http://toothycat.net/wiki/wiki.pl?Contradictanym

Another word for it is ‘contranym’. Two types can be distinguished. There are those known as doublets, which have a common etymology, such as ‘fast’. Then there are those which are quite separate words that happen to be spelt the same way, such as ‘cleave’.