I just can’t believe we don’t have this yet!! My 0.02 on the plugin:
Option to limit word cloud based only on links inside the current document (whatever child md counts)
Option to exclude words (so we can fine tune word count consistency)
The feature to see a word cloud would help A LOT on understanding common concepts between related documents and whatever one uses obsidian for. A must have plugin, maybe as other suggest here, part of core obsidian, since it already counts document words, but I guess a plugin can do the job just fine!!