Final answer:
The term 'major' is not a synonym of 'tiny' as it indicates something large in size or importance, in contrast to 'tiny', which denotes something very small.
Step-by-step explanation:
The word that is not a synonym of "tiny" among the provided options is major. The term microscopic implies something that is so small that it might require a microscope to be clearly seen, and it is similar to the term "tiny". Micro, originating from Greek, means "small" and is often used in contexts such as the microscopic domain of chemistry.
Meanwhile, miniature suggests a small scale version of something, which is another way to express the concept of being tiny. On the other hand, major is typically used to describe something that is large in size, significance, or importance, which is the opposite of what "tiny" represents.