I want to know that why is damn considered a swear word while dang and darn are never considered swear words.
Learn English – Why is damn a swear word while dang and darn aren’t
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What about the concise, memorable, and conveniently alliterative expression WHILE YOU WAIT, which is sometimes seen on business signs?
If someone can remember that three-word phrase (and the pictures I've added might help someone do just that), then it might be easier for them to remember how while would be the word that means "during some time interval."
Once you get one half of a confusing pair straight in your mind, the other half pretty much falls into place by default. But if you wanted something more, you could simply imagine the business owner saying:
I can fix this while you wait; you won't pay until I'm done.
From American Heritage Dictionary -
Nut (slang) - a crazy or an eccentric person
This would indicate that the terms nutty, crazy and eccentric may be interchangeable in some contexts.
Now my opinion (sorry, not a native though!).
When you call someone 'crazy', it adds a bit of danger there (Don't go near him, he's crazy, he can beat up you); nut is more kind of a fool, funny looking OR (at times innocent? -I remember Mary Jane calling you are such a nut to Peter Parker); eccentric is a person with odd or unusual personality.
Best Answer
Your confusion likely comes from seeing all three of these words used as expletives. When someone is upset, they might say any of these three words, and yet Damn is considered very offensive, while the other two are considered less so. (Darn and Dang are still never used in formal English)
This is because Damn is considered a swear word in English, for historical and religious reasons (as SamBC mentioned earlier). When you want to say a swear word, but don't want to be offensive, people create "Minced Oaths". A minced oath is created by changing one or more sounds of the swear word, but not so much that a native speaker can't tell that it's been changed. The words are similar enough that the intent is conveyed without actually saying the offensive word in question.
English has many swear words. English has many MORE minced oaths in order to avoid saying the swear word. For any given swear word, there is likely at least one, if not dozens of minced oath versions of that swear word.
What makes a word a swear word? Culture. Typically religious taboos and gross violations of social norms. Swear words vary from language to language and culture to culture, and even within a single language you might find some regions consider a word more or less offensive than another region. (For instance, Cunt is considered extremely and excessively offensive in America, to the point where it's almost never used even by coarser types of people, while in England and Australia it might be considered a mild swear at worst, or even simply a casual word causing no offense outside of formal situations)
What makes a minced oath acceptable? The fact that it is not the original word. That said, be careful of your audience, as SOME groups and individuals consider some minced oaths to be as bad as the original swear. For example, if someone is offended by the use of Jesus as a swear, Jeebus (a minced version) may still be offensive, yet Jiminy Cricket (a slightly archaic minced version of the same) could be acceptable.
What makes a minced oath understandable? The fact that it sounds similar to the original word without sounding more similar to any other word. (This is why typically only native speakers can make new minced oaths... your working vocabulary has to be large enough to know that your minced oath isn't more similar to a different word instead)