A great free app that I recommend is called Bluster! It is a fun way to practise rhyming words, prefixes, and synonyms. You can play single player, head-to-head, or as a team. My grade 3/4’s enjoy playing it as a early finisher game or when I assign it as a task.
If you want more tasks, options, and levels you would have to purchase the deluxe app but for my class, I find the free app is perfect!
Leigh Cassell Consulting 
Thank you so much for sharing that app! I know there will be several other teachers and students who will enjoy the literacy-based educational games.
Leigh
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