From the linked paper: >For each vocabulary test, a random sample of 67 words and 33 nonwords was selected. For each letter string, participants had to indicat

From the linked paper: >For each vocabulary test, a random sample of 67 words and 33 nonwords was selected. For each letter string, participants had to indicate whether or not they knew the stimulus. At the end of the test, participants received information about their performance, in the form of a vocabulary score based on the percentage of correctly identified words minus the percentage of nonwords identified as words. I think a lot of commenters are understanding the task as "define with confidence" rather than "recognise as a meaningful word". I couldn't give you a firm definition of many listed words, but I only don't recognise 2 of them. It's definitely interesting, but I think it raises questions about sample quality and respondent confidence at least as much as it provides information about sex & gender differences.