ferrule / ferule are similar-sounding terms with different meanings (referred to as homophones). To better understand the differences, see below for definitions, pronunciation guides, and example sentences using each term. 👇
ferrule: (noun) a metal cap or band placed on a wooden pole to prevent splitting.
ferule: (noun) a switch (a stick or cane or flat paddle) used to punish children.
ferrule: NA
ferule: NA
(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license. Definitions drawn from WordNet.)