The best alternatives to TenWords are Duolingo, 10,000 sentences, and EmojiStone. If these 3 options don't work for you, we've listed a few more alternatives below.
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AssemblyAI— Speech-to-Text API with superhuman accuracy
Word Chain is a simple, fun and educational Word Puzzle Game which you can play with your friends & family or alone with Wordy - our Intelligent Word Bot.
Open source application for learning foreign words using flashcards and spaced repetition that requires you not only to provide the translation of a word but also a definition and example use of the given word.