bookworm
US /ˈbʊk.wɝːm/
UK /ˈbʊk.wɝːm/

1.
a person who loves to read books and spends a lot of time reading
:
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My sister is a real bookworm; she reads at least two novels a week.
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He spent his childhood as a quiet bookworm, always with his nose in a book.
2.
the larva of an insect that feeds on the paper and glue in books
:
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The old manuscript was damaged by bookworms.
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To prevent bookworms, store books in a dry, cool place.