Chink and Rent
Similar meaning words
Rent noun - An open space in a barrier (as a wall or hedge).
Usage example: peered through the rent in the old garden wall for a glimpse of her mysterious new neighbor
Chink is a synonym for rent in opening topic. You can use "Chink" instead a noun "Rent", if it concerns topics such as flaw.
Google Ngram Viewer shows how "chink" and "rent" have occurred on timeline