The term 'invasive' can be defined as 'trespassing', which is an 11 letter word. Invasive species are plants, animals, and microorganisms that are not native to a particular area and cause harm to the environment, economy, or human health. They can outcompete native species for resources, spread disease, and disrupt ecosystems. Invasive species are a major threat to biodiversity and can have devastating effects on native species.