Another word for opposite is antonym. The opposite of something is the reverse of that thing. For example: the opposite of girl, is boy; the opposite of up, is down; and the opposite of left, is right. There is an opposite worksheet that you can print on this website: http://www.tlsbooks.com/oppositeworksheet3.pdf . And, this website: http://bogglesworldesl.com/opposite_worksheets.htm , has an
. entire collection of opposite worksheets.