But this past June, Ken Hyland and Poly Tse published an article in TESOL Quarterly called 'Is there an "academic vocabulary"?' Here's the abstract:
This article considers the notion of academic vocabulary: the assumption that students of English for academic purposes (EAP) should study a core of high frequency words because they are common in an English academic register. We examine the value of the term by using Cox-head's (2000) Academic Word List (AWL) to explore the distribution of its 570 word families in a corpus of 3.3 million words from a range of academic disciplines and genres. The findings suggest that although the AWL covers 10.6% of the corpus, individual lexical items on the list often occur and behave in different ways across disciplines in terms of range, frequency, collocation, and meaning. This result suggests that the AWL might not be as general as it was intended to be and, more importantly, questions the widely held assumption that students need a single core vocabulary for academic study. We argue that the different practices and discourses of disciplinary communities undermine the usefulness of such lists and recommend that teachers help students develop a more restricted, discipline-based lexical repertoire.
I wondered if the Hyland & Tse study's results had anything to do with the small corpus size. Their corpus is only 3.3 million words, somewhat smaller than Coxhead's 3.5 million-word corpus. Nowhere do they examine whether their results are statistically significant and I'm afraid that my stats are not up to the task either. But there's a much larger corpus that we can compare results against to see if the findings hold up: the British National Corpus using the VIEW interface.
At one point, Hyland & Tse write,
Table 6 shows the main meanings for selected words with different overall frequencies in the AWL together with their distributions. The first four are from our high frequency list, with occurrences above the overall mean, and show that even where uses are very frequent, preferred uses still vary widely, with social science students far more likely to meet consist as meaning "to stay the same" and science and engineering students very unlikely to come across volume meaning " a book or journal series" unless they are reading book reviews.
Where they talk about consist as meaning "to stay the same", they are referring to the word family and, I assume, to the words consistent and consistently. Here is the relevant data from Table 6.
So, what happens when we look at the same numbers in the BNC?
The range drops from 30% to 20% but is still notable. I'll poke around a bit more and see what I turn up.