You Do Need power plug adapter while traveling from Nigeria to Comoros.

Here is Why You Need An Adapter

The outlet and plug type used in Comoros are C and E and in Nigeria are D and G. This is how they look like.

Nigeria

In Nigeria, outlets of type D and G are in use.

Type D

Type G

Comoros

In Comoros, outlets of type C and E are in use.

Type C

Type E