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Tool can be export database structure to word, excel and pdf

Any Tool can be export SQL Server database structure to word, excel and pdf

Database structure meaning
Tables and Fields
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Senior .Net Consultant
Top Expert 2016
Top Expert 2011

any data modelling product woulld do that for you (ERWIN , POWERDESIGNER, rational, even visio...)

normally you should be working in the modelling tool to design and support the database ... and migrating scripts from the model to the database....

the modelling tool has a variety of report which help to document the structure and function of the databse...
Scott HelmersVisio Consultant, Trainer, Author, and Developer
Most Valuable Expert 2011

Visio can definitely reverse engineer a SQL database. From there it's very easy to publish to PDF, especially with Visio 2010: once you've created the database model in Visio, select File>Save & Send>Create PDF/XPS Document.