Correct spelling, explanation: Buddha is a word with a long history as it derives from Sanskrit. There was the form budh, which could be translated as to awaken. Therefore, Buddha means the man who is aware or awakened. The word Buddha entered English when Buddhism started to become popular in English speaking countries.

Definition of Buddha:
1. noun – the holy man whose life was the ground for Buddhism; image or statue of Buddha.
As we know from the life of Buddha, misery is an avoidable part of life and we need to learn to accept it.
He’s been into Buddhism for a few years and there is a beautiful image of Buddha on the wall in his living room.

Collocations with Buddha:
A few common collocations with Buddha are: festival of Buddha, life of Buddha, and the philosophy of Buddha.
There is an annual festival of Buddha in the region, which is amazing with all those colors and flowers.
The life of Buddha teaches us that we need to try to stay calm no matter what happens to us.
According to the philosophy of Buddha a man should focus on the present time and stop thinking about the past or the future.

Incorrect spelling, explanation: the pronunciation of the word Buddha is different than its spelling. As a consequence, the two last letters of the word are often mixed and instead of Buddha the word is often spelled as Buddah. However, the last letter of the word is an -a and the only correct spelling is Buddha.