Vocabulary Builder is a Study & Practice app of English Language for students preparing for competitive exams. The app contains hundreds of. 1. Synonyms. 2. Antonyms. 3. One word substitutions. 4. Homophones & Homonyms. 5. Phobias. 6. Foreign Words & Phrases. 7. Idioms & Phrases. 8. Phrasal Verbs. 9. Words. Along with Objective Type practice sets.