laundry/clothes pegs, clippers, pins, clamps, all understood by different regions (and frequency)?
I heard those terms in all combinations and forms, be it in europe, america or australia, however I couldn't really figure out if they are generally all understood and which ones are used mainly in which regions?

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I'm from the northeastern USA. I know these objects as "clothespins". According to https://en.wikipedia.org/wiki/Clothespin,  "clothespin" (as one word) is the usual word in US English and "clothes peg" (as two words) is the common word in UK English.

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the only ones I am familiar with (and I have been doing laundry for a LONG time) is laundry/clothes pegs. I have never heard the other terms used. Although I do have a set of Japanese futon basami which are big clamps used to fix the futon over a balcony railing, or similar. But the average non-Japanese person has probably never seen them.

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laundry/clothes pegs,  - sure
clippers - what? A beard trimmer? Something for shearing sheep?
pins - sewing pins, yes, We put a pin in your hip (surgery), drawing pin (thumb tack)
clamps - automotive or DIY hobby, large.
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New Zealand English. :)