添 vs 加（近义词）

1)Both 添 and 加 are verbs meaning "to increase", but 加 has more usages than 添.
2)添 means "to add more to what is already there"and is mostly applied to human beings or concrete things:
3)添麻烦，添乱 are idiomatic phrases:
4)In examples①②③above,加 can be used to replace 添，but not in examples④and⑤.

1)加 has more usages than 添.It can mean"to increase, enlarge,raise",e.g.:
2)In example①加can be replaced by 添，because it means"to become larger in amount",while in examples②and③it means"to enlarge or raise"and cannot be replaced by 添.
3)加can refer to adding what was not there originally.has no such meaning.e.g.:
4)加 has the meaning of"putting together two or more numbers or things".添 cannot be so used: