Task description incorrect

The task description says that words should not be part of other words, but the accepted solution does not follow this.

As a particular example:

count_words("Far far away, behind the word mountains, far from the countries Vokalia and Consonantia, there live the blind texts.",["far","word","vokal","count","tries"])

The accepted answer is 5, but this means that "countries" matches both "count" and "tries", which are overlapping.