I want that autocomplete functionality in a text box, its possible?

Please be more descriptive on what you describe as "predictive text", without that it is very hard to answer.

Every lookup field that aids in relating one object to another has autocomplete functionality as you type. As you can understand, any prediction needs a basis, so a table is the bare minimum to have that information.

For example in the form of a Person object, if you place a lookup to the Country table, you will see that is autocompletes your initial letters to any country you have in that table.