DispatchQueue.global(qos: .userInitiated).async {
let realm = try! Realm()

let cachedWords = CashedWords()
cachedWords.words.removeAll()

let predicate = NSPredicate(format: "enabled == 1")
let results = realm.objects(Word.self).filter(predicate).distinct(by: ["title"])

let azer = Locale(identifier: "az")
let alphabeticallySortedResults = Array(results).sorted {
    $0.title.compare($1.title, locale: azer) == .orderedAscending
}

cachedWords.words.append(objectsIn: alphabeticallySortedResults)
try! realm.write {
    realm.add(cachedWords)
}
let wordsRef = ThreadSafeReference(to: cachedWords)

DispatchQueue.main.async {
    let realm = try! Realm()
    guard let wordsResult = realm.resolve(wordsRef) else {
        return // object was deleted
    }

    self.words = Array(wordsResult.words)
    self.reloadTableInMain()
}