The best answer is extra. The relationship between the first pair of words, IMAGE and PICTURE, is that of synonyms—words that have similar meanings. Therefore, the second pair of words must also be synonyms. Extra is a synonym for spare.
Yesterday's Analogy Quiz
Tomorrow's Analogy Quiz
About Infoplease, Part of Family Education Network
© 2000–2015 Sandbox Networks, Inc., publishing as Infoplease