Wordbook, dictionary (7)
I believe the answer is:
lexicon
I believe this is a double definition.
'wordbook' is the first definition.
(lexicon is a kind of wordbook)
'dictionary' is the second definition.
(I know that dictionary can be written as lexicon)
(Other definitions for lexicon that I've seen before include "Dictionary of terms" , "Book of words" , "Dictionary as of Greek or Hebrew" , "set of terms" , "Wordbook" .)