chromolithographer (18 letters)
counterdemonstrator (19 letters)
The longest ones I could find in Webster's Second International dictionary are 17 letters long: antiagglutinating autoagglutinating
Bellybuttons would be the longest word I can think of beginning with a 'b' and ending in an 's'.
You tell me :P
Nivada?:)
firetruck
no. no.
Nicaragua
5 letters
letters
Greenpeace.
ceasechimechivechokechosechuteclosecremecrimecrazecursecurvecycle
recognizable