First of all, look at this link

Basically, the default Lorem provider that comes with the library is very limited when generating unique words. The internal lorem-ipsum words-list comes with 182 unique words only.

This provider does just one thing: It extends the default Lorem provider, and changes the word-list with English words (I got the dictionary from here, I removed a couple of lines however), which contain about 400k words.

$ composer require --dev breda/faker-provider-english-words

// Assuming everything is auto-loaded
// Create faker
$faker = Faker\Factory::create();
// Just make sure the default Lorem provider is not added after this. 
$faker->addProvider(new BReda\Faker\Provider\EnglishWords($faker));

This will throw this exception Fatal error: Uncaught OverflowException: Maximum retries of 10000 reached without finding a unique value

// Create faker
$faker = Faker\Factory::create();

foreach(range(0, 2000) as $i) {
    echo $faker->unique()->word;
}

This will not throw an exception and will successfully print 200,000 unique words from the English language.

// Create faker
$faker = Faker\Factory::create();
$faker->addProvider(new BReda\Faker\Provider\EnglishWords($faker));

foreach(range(0, 200000) as $i) {
    echo $faker->unique()->word;
}

And that's it!