The term 'LAMP CORD' can be broken down into two words, 'LAMP' and 'CORD'. The word 'WICK' is a four letter solution to this crossword. A WICK is a piece of material that is used to draw fuel up from a container to the source of combustion in a LAMP. It is usually made of cotton or other absorbent material. The WICK is lit, and the heat from the flame causes the fuel to evaporate and burn. This provides light and heat for the LAMP.