IroquoisIndians
Demisemiquaver(s)- the s makes it a 15 letter word. I hope this was the one you were looking for!
uncopyrightable Dermatoglyphics misconjugatedly
uncopyrightable
active transport
Defencelessness
misapprehension
15
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Punctuation mark is another word for parentheses or brackets.
uncomprehensive
Incomprehensive
"Electroencephalograph" is a 15 letter word that has the letter "e" five times and no other vowels. It refers to the measurement of electrical activity in the brain.