Calling Category name without the link

What you are looking for is get_the_category(). Retrieve a list of the categories, and then run a loop and only output their names:

$categories = get_the_category();
if ( ! empty( $categories ) ) {
    foreach( $categories as $category ){
        echo esc_html( $category->name );   
    }
}

This function returns an array of WP_Term objects. You can check the provided link for a list of available methods.