višak

1. excess; surplus
   Imam par kilograma viška. — I have a couple of extra kilos.
   Morao sam da platim višak prtljaga. — I had to pay for excess baggage.
2. (of a person, biti višak) someone surplus to requirements; a fifth wheel
   Na toj žurci sam se osećao kao višak. — I felt out of place at that party.
   Pola radnika je proglašeno tehnološkim viškom. — Half the workers were declared redundant.

The genitive viška after a noun means 'spare, extra': imaš li olovku viška? 'do you have a spare pen?'