If you are referring to the Hindu Caste System, they would belong to the Vaisya community. However, if you want a language terminology, then in Hindi it would be Vyapaari. In other Indian languages, the term would be different.
The merchants were the Mayan people that traded goods for things they might want.
Hindu clergy are priests. I think you address them as "Your holiness."
People following Hinduism do not have a specific word for Christmas because it is non Hindu festival. Hindu people usually call christmas christmas!
Everybody. Hinduism allows for all belief systems and the only thing that one has to do to be a Hindu is to call themselves a Hindu.
Merchants guild
cheeese
mandir
Because they are common to both the Hindu and Arabic language.
Follower of Hinduism is called a 'Hindu'.Follower of Hinduism is called a 'Hindu'.
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A Hindu teacher is called Guru. Some people also call him shikshak.
Because that was the region of the world where Hindu-Arabic numerals originated from.