jargonaut

Blend of jargon +‎ argonaut

jargonaut (plural jargonauts)

1. Someone who uses jargon excessively.
   • 2006 Sept. 24, William Safire, "On Language: Pretexting," New York Times (retrieved 20 Nov 2012):

     Only a generation ago, some academic jargonaut coined prioritize, meaning “give priority to” or “rank in order of importance,” and stiffs like me ran to the ramparts to denounce it as ugly, bureaucratic and unnecessary.

2. Someone who is adept at using jargon.

• jargoneer
• jargonist