Perhaps you are asking why people tend to capitalize Word when referring to the Bible even though this is not done in scripture. I think it is a matter of respect for the Bible. In the same manner, many people (myself included) tend to capitalize pronouns referring to God.
DS-11 Application Form for New Passport. Form DS-11. The DS-11 Application Form for New U.S Passport is an application form that should be used when you are applying for a new U.S. passport or when you are replacing an expired U.S. passport that was issued to child under the age of sixteen; Or for a lost passport.
When referring to a document number for a passport, generally that is the passport number. If it is a US Passport, that it is the 9 digit number located in the top corner of the passport info page. Other Countries have different types of numbers (usually with letters added) but most often it's in the same place. This Canadian Passport number is AB504966.