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There is a wide used expression in Russian "художественная литература" or more formal "беллетристика". It includes novels, poems, stories, tales, sci-fiction... in another words all books for fun.

My working class origin says to me about "flour". :) I imagine a 50 kg flour bag. :) Actually it depends on context, you are right. I never expect to see "sufferring" in a cooking recipe's book. But...

The words мука (flour) - мука (suffering) are usually printed with stress mark.