IPA: /ˌbɪblɪˈθɛkə/
KK: /ˌbɪblɪˈθɛkə/
A collection or catalog of books, often referring to a library or a list of books available for reading.
The bibliotheca contained thousands of ancient texts and manuscripts.
Bibliotheca is formed from "biblion" (meaning book) and "theke" (meaning repository or place). The word refers to a place where books are stored or kept, hence a library.
Think of a 'repository' ('theke') for 'books' ('biblion') — that's what a bibliotheca is, a place where books are kept.
No commonly confused words.