In current parlance word "wushu" is often used as a synonym for kungfu. More specifically, it frequently refers to the modernized kung fu as a performance sport promoted by People's Republic of China.
Note: The Actual reading of Wushu (武術) is 武 wu (martial, fighting, war) 術 shu (art) so literally means martial art.
In full historical perspective, "wushu" means all aspects of person-to-person combat. It is not used to refer to troop movements, fighting army against army, etc. But it does include swordsmanship, the use of hafted weapons, the use of "flying knives" (biao), wrestling, locking techniques (qin na, akin to Japanese aikido), and so forth.