You could use any word in that way though.
Cryptoslippers.com could be a website where:
- people come to relax and read about crypto
- a crypto community for old people who want to connect with other old crypto users
- a place where people can buy slippers with Bitcoin
But it's still a not a good name which makes you screw your face up when you first read it, just like BitcoinRoot.com does imo.
"Root" means literally nothing, no matter how much you try to shoehorn it into some kind of meaning. A name like BitcoinHero.com is a winning name, or a name like BitcoinHub.com. BitcoinRoot is not and that's why it's still available. Just like BitcoinCabbage.com I would imagine.
By that way, one more constructive critique - literally all of the ideas you listed have all been done already, multiple times over each. If you combine a wishwashy brand name with an idea that's already got a bunch of platforms doing it that have been operating for years, you're almost guaranteeing your failure.
Look for a better name that has meaning, even if you have to spend more for it, and look for new ideas or upgrades of old ideas.. not the same old worn path that's been walked along in the crypto space for years already.
Lastly, "bitcoin" + "root" is not keyword rich. "bitcoin" + "trading" is keyword rich, and "crypto" + "strategies" is keyword rich. But the word "root" is not a high value keyword within the crypto space at all, any more than the word "slippers".
If you want brandable and powerful crypto domain names, go for "coin" + (a legitimate and relevant keyword).com, like how "coin" + "base" is a strong brand, or "coin" "marketcap" does the same.
There aren't a bunch of high profile crypto brands that start with "bitcoin" for a good reason.. they got snapped ages ago and the people holding them think they're worth $100,000 each. I own about 100 "coin" + (good keyword).com's, they're a much better place to look for solid domains than "bitcoin" domains.