From Longman Dictionary of Contemporary Englishbookwormbook‧worm /ˈbʊkwɜːm $ -wɜːrm/ noun [countable] 1 READsomeone who likes reading very much2 HBIan insect that eats books
Examples from the Corpus
bookworm• I was a real bookworm when I was a child.• an ideal gift for the bookworm in the family• Fox never could understand why the bookworm had to read to gain knowledge. 