Mammoth Uncensored Word List:
36 words that are 13 letters long beginning with j in the mammoth uncensored word list.

jabberwockies jackhammering japonaiseries jargonisation jargonization jawbreakingly jawdroppingly jealousnesses jejunectomies jejunostomies jellification jellygraphing jerrymandered jitterbuggers jitterbugging jitterinesses joblessnesses jointednesses jollification joylessnesses judgmatically judiciousness juglandaceous jurisconsults jurisdictions jurisprudence jurisprudents justicialisms justiciarship justification justificative justificators justificatory juvenescences juxtalittoral juxtaposition