You don't want to register just any random word. Focus on these three categories:
Registering a "fresh" name that no one owns for ~$10–$15 via registrars like Namecheap or Cloudflare . make money buying and selling domain names
Short, catchy, and easy-to-pronounce words (like Loom , Slack , or Figma ). These are harder to find but sell for the highest prices. You don't want to register just any random word