freebooter
Concise Oxford English Dictionary © 2008 Oxford University Press:
freebooter/ˈfriːbuːtə(r)/
▶noun a pirate or lawless adventurer.
– derivatives
freeboot verb.
freeboot verb.
– origin C16: from Du. vrijbuiter, from vrij ‘free’ + buit ‘booty’.
'freebooter' also found in these Oxford entries:

