From a cross-project redirect: This is a redirect from a title linked to an item on Wikidata. The Wikidata item linked to this page is hydronymy (Q15635924).
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From a related word or phrase: This is a redirect from a word or phrase (term) to a page title that is related in some way. This redirect might be a good search term, or it could be a candidate for a Wiktionary link.
Redirects from related words are not properly redirects from alternative spellings of the same word. They are also different from redirects that are subtopics or related topics, because unlike those, a related word or phrase probably does not warrant its own subtopic section in the target page or possess the possibility of ever becoming an article, template, project page, and so forth.
When appropriate, protection levels are automatically sensed, described and categorized.