One Word Substitutions’ is a kind of a reverse dictionary. One Word Substitutions questions are asked in various competitive and recruitment examinations to evaluate the students’ command over English vocabulary. The questions on the basis of this ask the students to answer by writing a single word which can be used appropriately in place of the given description. Knowledge of one word substitutions will help aspirants not only in scoring well in exams but also in achieving excellent proficiency in English language. The present book is a fairly good collection of one word substitutes. Though it is not an exhaustive list, it is certainly an honest effort to explain highly useful words. The book includes words and definitions which are often asked in national and international competitive and entrance examinations. Moreover, the knowledge of these words will also help the students and learners of English to enhance their writing, speaking and reading skills.