Why Synonyms module?

The Synonyms module enriches all Entities with the notion of synonyms.

It supports synonyms through Base fields, Attached fields and Entity properties.

The very basic purpose of Synonyms module would be to provide synonyms for taxonomy terms. These synonyms can also be term plurals, term typos, term variants etc. It can also provide user nicknames for User entity etc.

The module functionality can be used in many other use-cases as well:

1. Let's say you want to be able to get user suggestions inside user's autocomplete widget not only by typing username but by typing the user ID as well. In this case, the "User ID" property can be enabled to provide "synonyms" for user entity and you will be able to type both user name and user ID into autocomplete widget and get autocomplete suggestions for usernames which match the input.
2. Let's say you have an "Event" content type with an "Event location" entityreference field. And you have a "Recent Events" view with "Event name" exposed filter. If you would like to be able to search both event names and Event locations within the same exposed filter Synonyms module can help. You can enable the "Event location" field as synonym field for Event content type and use Synonyms friendly "Synonyms of content item" exposed filter in your view.

There are unlimited use-cases how you can take advantage of the Synonyms module. The examples above are here just to give you some idea what can be accomplished... and it's up to you to use it to serve your particular needs.

The Synonyms module is not a very simple one to use... so reading through documentation and following it is essential if you want to use Synonyms module properly and efficiently. You can start with Installation and basic usage tutorial and read more as needed.