The Companion to "Spark 1" 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 800 vocabulary entries, with all the new words and phrases from the coursebook explained in detail and labelled according to parts of speech
- pronunciation guide to all vocabulary entries
- accurate explanations in Greek
- synonyms and/or antonyms
- functional examples of most vocabulary entries
- lexical exercises practising all essential vocabulary as well as grammar exercises
- Grammar Bank section with grammar theory in Greek
- glossary for "Spark 1" Workbook
- an Index to the vocabulary entries