There is a fish factory in which there are 2 people who check the fish to find worms in them.
Would it sound natural if I call them 'worms checkers'?
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No, it isn't quite correct to say "worms checkers".
Usually when making a plural compound noun, the plural "s" only appears on the last noun. So, in your example, that would be "worm checkers". This is similar to compound nouns like coffee experts, apple pickers, grave diggers, ticket inspectors, or book binders, etc.
And yes, "worm checkers" will be understood as people who check for worms. However you could also say "worm inspectors", which sounds a bit more formal, more like an official job title. I see no real problem with using the word "checkers" in this way, though. It's perfectly understandable.
One who checks.
- A reprover, rebuker, fault-finder; a controller.
Perhaps a more formal title would be better though. Fish parasite inspector sounds good to me, and less ambiguous.