Take the word WORD. Add an N, and you can make DROWN, add an S and you can make WORDS or SWORD. Add a J and you get... well, nothing, actually, because no combinations of the letters WORDJ make a word. Are there any words that can combine with a J to make a new word? Of course: SAW + J = JAWS; BAA + J = BAJA, etc. Are there any words that can combine with any of the 26 letters to make a new word? Such a word would be a universal recipient, like someone who has type AB blood, and therefore we can call such a word an AB-word.
"The Suet Alphabet,"
Word Ways: Vol. 30
, Article 3.
Available at: https://digitalcommons.butler.edu/wordways/vol30/iss3/3