It's possible that:
* It's a misspelling: There might be a similar word in a particular language with a slightly different spelling. Could you double-check the spelling?
* It's a regional term: It might be a local word or dialect term specific to a particular region or community.
* It's a made-up word: It could be a fictional word created for a specific context, like a book or a game.
To help me understand, please provide more context:
* Where did you encounter this word?
* What was the context?
* Do you have any more information about it?
With more information, I might be able to help you decipher the meaning of "arachakam."