There is no Swahili word for circus. You would need to describe what is done or just use the English word, as most East Africans do.
The Swahili word is "shetani".
The Swahili word for grief is huzuni.
The Swahili word for pastor is "mchungaji."
The Swahili word for goat is "mbuzi."
The Swahili word for "nothing" is "hakuna."
The Swahili word for master is "bwana".
The Swahili word for "Hippopotamus" is "kiboko".
The Swahili word for "Skin" is "ngozi".
The Swahili word for "Honey" is "asali".
Swahili word for desert is "jangwa"
The Swahili word to learn is 'kufunzwa' . Pronounciation: koo-foon- zuwa
The Swahili word, mbili means 'two'.