Understanding the Phrase: Collecting Books as a Hobby

The question asks for a single word that means the same as "a person who collects books as a hobby". This means we need to find a term that specifically describes someone whose pastime or interest involves gathering books.

Analyzing the Options for a One-Word Substitute

Let's examine each option provided:

• bookworm: This term usually refers to someone who reads a lot. While a person who collects books might also be a reader, the term 'bookworm' doesn't specifically imply collection as a hobby. It focuses primarily on the act of reading extensively.
• bibliophile: This word comes from Greek roots: 'biblion' (book) and 'philos' (loving). A bibliophile is someone who loves books, and this love often manifests as collecting them. This term directly matches the definition of someone who collects books as a hobby.
• lexicographer: A lexicographer is a person who writes or compiles dictionaries. Their work involves language and word definitions, not specifically the hobby of collecting books.
• linguist: A linguist is an expert in or student of language, particularly linguistics, the scientific study of language. This is related to language structure and history, not the collection of books.

Conclusion: Identifying the Correct Substitute

Based on the definitions, the word bibliophile is the most accurate one-word substitute for "a person who collects books as a hobby". It captures the essence of loving and actively gathering books as a dedicated interest.