IroquoisIndians
Demisemiquaver(s)- the s makes it a 15 letter word. I hope this was the one you were looking for!
uncopyrightable Dermatoglyphics misconjugatedly
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Defencelessness
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misapprehension
active transport
"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.
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Punctuation mark is another word for parentheses or brackets.
uncomprehensive
Incomprehensive