Only if it's ingame.

Also, seeing as you're a speech therapist person in training, mention the easy to use controls, and the ability to change difficulty, so that it can accompany the likes of people of all ages. Having an infinite world that you can control may help a child boost it's confidence in talking.

Also, say that if a child once again who has difficulty communicating, state that since each block is nearly unique, it shall help build up key speech skills. Sure, the word obsidian doesn't come into action in most day-to-day terms, but the child can progress through speech therapy bit by bit as he or she learns new words to accompany different items, helping him or her along the way.

Source: My drunken brain.

Now get off reddit and get on with your revision!