An official website of the United States government

Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Library thesaurus

Our thesaurus provides a list of terms commonly used across the fire, Emergency Medical Services and emergency management sectors. It points you to the best terms for searching collections through our online catalog. We welcome your suggestions for new or revised terms.

To find a term, click on one of the letters below to browse alphabetically.

Note: the Library of Congress source code designation for this thesaurus is "netc."