If your child needs help expanding their vocabulary, here is a simple technique that will help you. Although technology is a wonderful tool that we have access to today, not everyone can afford the newest vocabulary education software. Therefore, I believe that the old ways, in this case, are the best.
To help your child with their vocabulary you first need three things: a dictionary, a thesaurus, and a story book (be sure it is a book your child is able to read on their own). As your child reads this book, have them identify any words that are confusing or new to them. They can either mark these words with a sticky note or write them down on a piece of paper. For each mystery word, have your child find the definition of the word, and a synonym and antonym (if possible) for the word. If your child can't find synonyms or antonyms for the word, have them come up with adjectives and nouns related to the word. For example, "house" can be described as being made of "wood" and has "windows." You will have to teach your child how to use a dictionary and a thesaurus, but this skill will pay off. It will not only teach your child the meanings of new and complex words, it will give them the skills they need in order to become advanced students who know how to use different resources in order to learn new things.
Strategy inspired by National Education Association. (2013). Word webs. Retrieved from http://www.nea.org/tools/word-webs.html