IPA: /ˈhɪm.bʊk/
KK: /ˈhɪmˌbʊk/
A book containing a collection of hymns, which are religious songs or poems typically sung in worship services.
The church choir practiced from the hymnbook before the Sunday service.
Hymnbook → It is formed from "hymn" (from Old English *hymn*, meaning a song of praise) and "book" (from Old English *bōc*, meaning a written work). A hymnbook is a book containing songs of praise, typically used in religious contexts.
Think of a 'song of praise' ('hymn') collected in a 'written work' ('book') — that's what a hymnbook is.
No commonly confused words.