What you'd probably say, and what a biologist, a doctor or a scientific paper would call it. Biology has more terms than any other science — but most of them are just precise names for things you already understand.
Biology splits by scale more than by subject — from molecules up to whole ecosystems. Naming the level you're asking about is usually the fastest way to the right expert.
The working vocabulary, grouped by scale. The health and disease group at the end is the one worth reading even if you skip the rest.
Biology's conventions are mostly about names and formatting — and they carry real meaning. Italics, abbreviations and capital letters all say something.