infiltrator
in·filt·ra·tor
noun
1.
someone who takes up a position surreptitiously for the purpose of espionage
Origin
From infiltrate + -or.
Related words
Word family
WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.