The "Companion to Upstream Pre-Intermediate" is specially designed to enrich and enlarge students' 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 1400 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
- definitions of the words in English
- accurate explanations in Greek
- lexical exercises practicing all essential vocabulary including collocations, idioms, fixed phrases and world formation
- glossary for "Upstream Pre-Intermediate" workbook