The word "micra" holds a variety of synonyms that can be used interchangeably to convey the same meaning. Some common synonyms for "micra" include "micron," "μm," and "micrometer." These synonyms refer to a unit of length equal to one millionth of a meter, emphasizing the smallness or fine measurement it denotes. Another synonym often used for "micra" is "micron," which is widely used in scientific fields to describe microscopic measurements. Additionally, the term "micrometer" is also employed in technical contexts to indicate a unit of distance measurement for objects at a microscopic scale. These synonyms offer alternative ways to express the notion of extremely small measurements represented by the term "micra."