Every word in English falls into one of these grammatical categories. Here’s a quick reference, with example words and a sentence for each.
You'll get a clear not-found message rather than a guess. The tool only reports what the dictionary service actually returns — it doesn't try to infer a part of speech for a word it can't find.
Yes, and the tool shows that. Many English words function as multiple parts of speech — "run" as both a verb and a noun, for example — so results are grouped by part of speech, with a definition shown for each one found.
The same dictionary service used by this site's Dictionary & Thesaurus tool, so results stay consistent between the two pages.
It shows the first definition that includes a usage example, where one exists, on the idea that an example sentence makes the part of speech clearer at a glance than a bare list of definitions would.