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):
Difference Between Tin and Aluminum. â¢ The atomic number of tin is 50 while that of aluminum is 13. â¢ Tin is silvery grey while aluminum is silvery white. â¢ Before aluminum arrived, people used tin foils in daily life. â¢ Tin is rarer than aluminum, which is 3rd most abundant element in earthâs crust.