The issue is that trademarking a single word like "doom" creates problems for the millions of possible uses for that word. Trademarks should not be basic units

The issue is that trademarking a single word like "doom" creates problems for the millions of possible uses for that word. Trademarks should not be basic units of common language. They shouldn't ever be single words (doom, apple, meta, square, etc), because single words are basic language building blocks. There ought to be a requirement that trademarks are reasonably unique to the company (Doom Inc. Apple Inc, etc). The onus should be on the trademarker to avoid entanglement with typical language use. It's unacceptable for a videogame franchise to encumber the word doom like this. I believe the comment you're replying to is including "common collactions" for the same reason. It shouldn't be possible to trademark groups of words in common use with established meaning.