You Do Need power plug adapter while traveling from Cape Verde to Guyana.

Here is Why You Need An Adapter

The outlet and plug type used in Guyana are A, B, D and G and in Cape Verde are C and F. This is how they look like.

Cape Verde

In Cape Verde, outlets of type C and F are in use.

Type C

Type F

Guyana

In Guyana, outlets of type A, B, D and G are in use.

Type A

Type B

Type D

Type G