Science & Technology
* Microscope: An instrument used to view very small objects.
* Microbial: Relating to microorganisms (tiny living things).
* Microbiology: The study of microorganisms.
* Microchip: A tiny integrated circuit used in computers and electronics.
* Microprocessor: The central processing unit (CPU) of a computer.
* Microwaves: Electromagnetic waves with wavelengths shorter than radio waves.
* Micrometer: A unit of length equal to one millionth of a meter.
* Microclimate: A small-scale climate variation within a larger climate zone.
* Micron: A unit of length equal to one millionth of a meter (same as micrometer).
* Microcosm: A small world or system seen as a representation of a larger one.
Other
* Microcosm: A miniature world or system representing a larger one.
* Microfinance: Financial services provided to low-income individuals and communities.
* Microblogging: Short, frequent posts on social media platforms.
* Microaggression: Subtle, indirect, or unintentional forms of discrimination.
* Micro-influencer: A person with a smaller but dedicated following on social media.
* Microsleep: A brief period of sleep lasting a few seconds.
* Micromanagement: Excessive control over the details of work processes.
* Microeconomics: The study of individual economic decisions.
* Micro-brewery: A small brewery producing craft beers.
* Micronation: A small, independent state or territory.
This is just a partial list, as there are many more words with the prefix "micro-".