According to my dictionary, 'xanthoproteic' in 'xanthoproteic acid' and 'xenodiagnosis' both have 13 letters. But, my dictionary is from 1989, so there may be newer words.
it's rhythm... and the longest word that having a single vowel is strenghts...
xenophobia is the only civil war word starting with x I no.
The word 'boom' can be used as a word for explosion that starts with a b.
intimidating, inspiring, in combat, incredious...
You can always use Xenophobia - the fear of the unknown.
The longest word that starts with q is quintoplets!!!What about Quartermasterships?
methionylglutaminylarginyltyrosylglutamylseryllleucylpheny
Kennethrobertofitzwaterayjameseepatriciacashiichelsayybrianaeasthamaiecaittlinapaigerboothean.
Lymphadenopathy
supercalifragilisticexpialidocious.
A word that starts with X is a xylophone.
SMILER - There is a mile between the s and the r!
A word that starts with S and ends with X is sphinx.
watermelons
21-letter wordbuckminsterfullerenes
Erectile
transformationalist