One word Substitution is one of the integral parts of vocabulary. It simply means that a sentence has to be replaced with a single word. This area requires a good vocabulary to solve the questions well. Questions based on one word substitution are often asked in various competitive exams.
For example: A hater of womankind - Misogynist
One easy method of doing one word substitution is by using the root method. Roots are nothing but the words from which the main word has been derived. In our other series of vocabulary, we have consolidated the lists of root words that will ease your preparation.
Infallible - one, who is free from all mistakes and failures
Learning through word roots will make it easy for you to grasp more and enhance your vocabulary. The above given list of word roots will surely help you in this regards. It's always advisable to learn one word substitution with the help of word roots to ease your vocabulary building and expand your word base exponentially.