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It seems to me there is the germ here of an article words derived from words which would discuss the distinctions drawn here (and some others, lots of words are formed from anagrams, such as crud which is an anagram of curd and lounge which is an anagram from the second word of chaise longue ("long chair). And portmanteau is thrown in here as an afterthought, and not explained as all. The Oxford English Dictionary agrees, advising, in its definition of initialism "Contrast acronym", and giving the definitions of each pretty much as I have them above (which I adapted from the Random House Unabridged and Webster's III. The "pronounceable" rule is not some weird American concoction, it is the difference between a word and a name. The present article suffers from the failure to make the distinction between a "word" and a "name". Naturally, these categories overlap for some people, but the differences seem pretty clear to me. portmanteau word is a blend word, a combination of two words, such as chortle (combining chuckle and snort), or by combining elements of two or more words, such as bookmobile ( book and automobile) or motel ( motor and hotel).initialism - a name formed from the initials of an organization, such as FBI (Federal Bureau of Investigation).That is, not only is NATO (North Atlantic Treaty Organization) an acronym, but also Interpol (INTERnational Criminal POlice Organization), and, two of the most famous acronyms of all, radar (RAdio Detection And Ranging), and sonar (SOund Navigation And Ranging). This is not restricted to initial letters, but can also be initial syllables. acronym - a word ( -nym) formed from the "high parts" ( acro) of a phrase or name.Despite all that is said above, the three have distinct meanings and should be carefully distinguished, not mixed all together. I'm coming in late on this, but this confusion between initialisms and acronyms andportmanteau words really needs to be fixed. Needs a rewrite and reorganization for clarity
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