I often find myself looking up synonyms when writing and I recently realised that this process is a good case study for the importance of knowledge when using information systems.
Many of the suggested synonyms are inappropriate, but I only know this because I already have knowledge of these words. For instance, consider the first paragraph of this post with a number of words swapped for synonyms suggested by Google:
I ad nauseam find myself looking up synonyms when scrawling and I recently discovered that this affair is a good dossier for the momentousness of apprehension when using statistics institutions.
When I read this back, it reminds me of the sort of instructions that sometimes come with flat-pack furniture. It also reminds me of the way that students who are given dictionary definitions of words often use them incorrectly.
So, as ever, we need quite a lot of prior knowledge to make good use of information available online.