Canadian English Language Proficiency Index Program (CELPIP) Vocabulary Practice Test 2025 - Free CELPIP Vocabulary Questions and Study Guide

The word "rampant" specifically describes uncontrolled growth, particularly in reference to plants, which can spread rapidly and without constraint. It evokes imagery of vegetation growing unchecked, often covering large areas and overtaking other plants. This term is frequently used in environmental contexts to denote a kind of growth that can be problematic, such as invasive species that dominate a landscape.

In contrast, "rancorous" refers to a deep-seated resentment or bitterness, which does not relate to growth. "Prosperity" denotes a state of flourishing or thriving, but is more aligned with economic or material contexts than biological growth. "Punctilious" refers to someone who is very careful about precise details and proper conduct, thus it does not pertain to the idea of uncontrolled growth. Each of these words carries a distinct meaning that does not align with the concept of rampant growth as effectively as the chosen word does.