If you create a thesaurus entry that corresponds to a search term for a keyword redirect, the keyword redirect has priority over the thesaurus entry.
For example, you might have a keyword redirecting “curtains” to http://example.com/fallsale/curtains.
If you have a one-way thesaurus entry, with a search term of “curtains” and synonyms of “drapes, shades” then the following occurs:
A shopper who enters “curtains” as a search term is redirected to http://example.com/fallsale/curtains
A shopper who enters “drapes” or “shades” as a search term is not redirected.
If you have an equivalent thesaurus entry, with synonyms of “curtains, drapes, shades” then the following occurs:
A shopper who enters “curtains” as a search term is redirected to http://example.com/fallsale/curtains
A shopper who enters “drapes” or “shades” as a search term is not redirected.