Significant and noticeable are similar in that they both refer to something that is worthy of attention or consideration, but they have slightly different connotations.
Something that is significant is important or meaningful, often in a way that has a big impact or influence. For example, a significant event might be one that changes the course of history or has a major effect on someone's life. A significant difference or change is one that is substantial or meaningful, rather than small or insignificant.
Something that is noticeable, on the other hand, is simply something that is easy to see or perceive, or that stands out in some way. Something might be noticeable because it is particularly large, bright, or noticeable in some other way. A noticeable change or difference is one that is easily perceived, but it may not necessarily be as important or meaningful as a significant change.
Here are a few examples to illustrate the difference:
The difference between the two candidates' policies was significant, as it would have a major impact on the country's economy.
The change in the weather was noticeable, as it was much colder and cloudier than the previous day.
The impact of the new law on small businesses was significant, as it would change the way they operate in a major way.
The increase in traffic on the road was noticeable, as there were many more cars on the road than