You Do Need power plug adapter while traveling from Israel 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 Israel are C and H. This is how they look like.

Israel

In Israel, outlets of type C and H are in use.

Type C

Type H

Guyana

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

Type A

Type B

Type D

Type G