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):
A: In some general contexts, memoir and autobiography can be used interchangeably. In fact, Amazon.com puts them in the same category. But thereâs a key difference that publishers use to define eachâthe timeline covered in the writing. (Get more advice in The Everything Grammar and Style Book) An autobiography focuses on the chronology of the writerâs entire life while a memoir covers one specific aspect of the writerâs life.