What is difference between object and entity?

A database object is represented as one of the following:

database, schema, table, column, primary key, and foreign key

A database Entity is:

An entity is a thing or object of importance about which data must be captured.

All things aren't entities - only those about which information should be captured.

Information about an entity is captured in the form of attributes and/or relationships. If something is a candidate for being an entity and it has no attributes or relationships, it isn't an entity.
Database entities appear in a data model as a box with a title. The title is the name of the entity.
A database object is represented as one of the following:

database, schema, table, column, primary key, and foreign key

A database Entity is:

An entity is a thing or object of importance about which data must be captured.

All things aren't entities - only those about which information should be captured.

Information about an entity is captured in the form of attributes and/or relationships. If something is a candidate for being an entity and it has no attributes or relationships, it isn't an entity.
Database entities appear in a data model as a box with a title. The title is the name of the entity.