When faced with an unknown or difficult word, search the definition and pronounce the word out loud. Familiarizing yourself with the word can make it easier to remember. Many readers skip over difficult to pronounce words. Doing this will prevent you from expanding your vocabulary. Another tip is to highlight difficult words or often repeated words. Going back and seeing your progress can boost your confidence and highlight growth. Finally, the best way to improve vocabulary is to read, alot. Especially starting from a young age. Many children who read a variety of materials early on in life have better language skills.