8. The system as recited in claim 6 , wherein providing the set of images representing conjunction of the first word and the second word comprises: performing an image search using the first word and the second word as a conjunctive query word; and selecting a fourth plurality of images from search results.
6. The system as recited in claim 1 , further comprising: providing a set of images representing conjunction of the first word and the second word, the set of images comprising a third plurality of images, wherein estimating the correlation between the first word and second word is further based on visual features of the set of images representing conjunction of the first word and the second word.