Conceitedness and Delusions of grandeur

Conceitedness noun - An often unjustified feeling of being pleased with oneself or with one's situation or achievements.

Delusions of grandeur and conceitedness are semantically related. In some cases you can use "Delusions of grandeur" instead a noun "Conceitedness".

Delusions of grandeur noun - A delusion (common in paranoia) that you are much greater and more powerful and influential than you really are.

Conceitedness and delusions of grandeur are semantically related. You can use "Conceitedness" instead a noun phrase "Delusions of grandeur".