换 vs 交换（近义词）

1)Both verbs mean”to change".换 is applied to concrete things and is more colloquial.交换 is applied to two parties,and besides concrete things,it can also be applied to abstract things.
2)Examples①②③all concern concrete things,so only 换 can be used.
3)Examples④and⑤also concern concrete things,but they involve two parties,so 交换 is used. Since the object is concrete,换 can also be used.Yet because换is monosyllabic and colloquial,了 or 一下 are often added:
4)Moreover,交换 can be applied to abstract things,e.g.交换意见(exchange ideas),交换秘密(exchange mutual secrets),交换看法(exchange opinions)and 交换俘虏(exchange captives)in particular.换 cannot be so used.e.g.:

1)换 can also mean"alternate,exchange",交换 has no such meaning.

1)换 can be used with words of time,e.g.换季(change garments according to the season),换代（产品)(replace the older generations
of products with new ones),换了人间(change the environment),改朝换代(dynastic changes),换届选举(re-election),etc.交换 cannot be so used.