I based my choice of 'haboob' on the Encyclopedia.com entry for 'sandstorm', which has the sentence:
'The haboob is a sandstorm prevalent in the region of Sudan around Khartoum.'
and the Encyclopedia Britannica Online, which has:
'hot and moist, strong wind that occurs along the southern edges of the Sahara in The Sudan'
Sounds pretty darn 'specific to one region' to *me*!
I think I got caught by a language issue here. In Dutch schools, at least, hundreds of thousands of children learn the word 'deler' (the Dutch for 'divisor'

when they are taught fractions for the first time in arithmetic class.
Only an, um, fraction of those children will go on to more advanced (University or pre-University) forms of mathematics teaching and encounter the term 'factor'. But of course I was thinking about 'everyday Dutch', so I shouldn't have expected my answer to be equally valid for 'everyday English'.