Trademark question about protecting domain name
I own a domain name that is pretty valuable, in my opinion. I sometimes think that my domain name could potentially be stolen one day through malicious use of my domain account, and/or some error that could occur with technology. I've been the rightful owner of this domain for many years, and would hate to lose it through no fault of my own.
My domain name is a .com that consists of 4 dictionary words put together. I once inquired with a law firm about trademarking the 4 words, but was told they would not likely be candidates for a trademark. This is because when put together, the words are "clearly descriptive," according to the firm.
I am now thinking about trademarking the entire domain, not just the 4 words. So I want to trademark "www.word1word2word3word4.com", and maybe other variations of it.
If I were to somehow lose the domain name, would owning such a trademark allow me to get it back?