This is a 7-column tab-separated list containing:

1. ID for word/picture group;
2. Word presented;
3. Picture displayed at top-left;
4. Picture displayed at top-right;
5. Picture displayed at bottom-left;
6. Picture displayed at bottom-right;
7. Difficulty level.

It is important to note that the difficulty levels were taken from a US test in which each word was read to the participant (from an audio file) rather than displayed visually upon the screen.

This resource be downloaded or viewed using the link: picvoc_test.txt

If you have wget available (typically on linux systems), then you can also obtain a copy using the command

 wget  -nd  biobank.ctsu.ox.ac.uk/ukb/ukb/docs/picvoc_test.txt