From a non-neutral name: This is a redirect from a title that is a non-neutral, perhaps pejorative, controversial or offensive word, phrase or name. It leads to the target page in accordance with Wikipedia naming conventions for neutrality in page titles and can help writing and searches. Normally, these redirected links should be replaced with links that go directly to the target page.
From a related word or phrase: This is a redirect from a word (or phrase) to a page title that is related in some way. This redirect might be a good candidate for a Wiktionary link.
Redirects from related words are not properly redirects from alternative spellings of the same word. They are also different than redirects from subtopics or related terms or topics, since a related word is unlikely to warrant a full subtopic in the target page, or to have the possibility of ever becoming an article.