Dictionary.com
Thesaurus.com

retentionist

British  
/ rɪˈtɛnʃənɪst /

noun

  1. a person who advocates the retention of something, esp capital punishment

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

For Minnesota's healthcare industry, an estimated 5,000 open nursing positions have sparked the invention of a new specialty, the nurse retentionist who is focused on convincing colleagues to stay on the job.

From Reuters

Retentionist sentiment, both in the Philippines and the U. S., has recently grown rapidly.

From Time Magazine Archive