As a verb thieve
is (intransitive): to commit theft.
As a noun stealer is
(mostly|in combination) one who steals; a thief.
(intransitive): To commit theft.
* thieve out
(mostly, in combination) One who steals; a thief.
(shipbuilding) The endmost plank of a strake which stops short of the stem or stern.
- a child-stealer'''; a chicken-'''stealer