uncopyrightable
Nonmodal is MAYBE the longest word.
hi
Youthfulness is the longest word starting with the letter Y. It contains twelve letters.
restate
The longest word starting with E is Electroencephalographically.
Bellybuttons would be the longest word I can think of beginning with a 'b' and ending in an 's'.
repeat
repeat
Biotechnological
Synonyms include redo (repeat process) or echo (a repetition).
Defeat or repeat.