Every one of them is missing something. mmnt has had its vowels taken out, and so has plcs; mntid folds mint and ID down into five letters, and emliq does the same to email IQ. What is left is the consonant skeleton: short enough to type without thinking, and unlikely to belong to anyone else. The switch in the header puts the vowels back.

beltborn and motogrounds keep every letter they were given. They are the road work rather than the tool work, and they are named the way you would say them out loud. The switch has nothing to hand back to those two.