According to Mayo Clinic, Down syndrome causes a distinct facial appearance, intellectual disability, developmental delays, and may be associated with thyroid or heart disease in a person. So calling people with this syndrome 'Mongoloid' is extremely vulgar and disrespectful to ethnic Mongolians. Likewise, how will the population react if Down Syndrome was associated with 'European' looks? If you use this term, you are automatically a xenophobic, in my opinion.
If any difference is noteworthy, it would probably be that an age is usually between two times, e.g. 1290-1450AD, whereas an era is less set - but that isn't a rule, its just a matter of usage. Synonyms would be epoch, or eon. Source(s):
Key Difference: Weather is the state or conditions of the atmosphere over a short period of time, usually a day or so. Weather and climate are words that are often heard in meteorology, while weather is also used in day to day in order to refer to the conditions outside. Weather and climate are similar, but different. The main difference between the two is weather changes day to day, while climate does not change for longer periods of day. Weather is the state or conditions of the atmosphere over a short period of time, usually a day or so. The weather changes day to day and forecasting must be done continuously in order to determine the sudden changes in the weather.