The "Companion to Blockbuster 4" is specially designed to enrich and enlarge student's vocabulary, focusing on the use of words in their everyday context. It functions both as a dictionary and as a supplementary practice book, thanks to its comprehensive lexical exercises.

The book consists of:
- about 1000 vocabulary entries, with all the new words and phrases from the coursebook explained in detail and labeled according to parts of speech
- pronunciation quide to all vocabulary entries
- grammar tables in Greek
- definitions of the words in English
- lexical exercises practicing all essential vocabulary as well as grammar exercises
- glossary for "Blockbuster 4" workbook and grammar book.