"aha" is the correct spelling.
Oho! Aha!
Oho Aha
aha, oho
The word "aha" is a verbal representation of an exclamation of understanding, realization or recognition.
Oho, Aha, Wow
No, it is not a noun. It is an interjection, an exclamation of triumph or realization.
Aha, oho, wow
wow, aha, oho
Oho! Aha! Wow!
In Spanish, "aha" does not have a specific meaning. However, if you are referring to "ยกAha!" (with an exclamation mark), it is an Interjection that expresses surprise, realization, or understanding.
Yay would be the correct word to use in this case.
Hey. Oh um boo haa