a container with a spout, a handle and a lid (= cover), used for making and serving tea 茶壶 
She refilled the teapot with boiling water. 她把茶壶又添满了开水。
Idioms
a tempest in a teapot (North American English)
(British English a storm in a teacup)
a lot of anger or worry about something that is not important 茶杯里的风暴；大惊小怪；小题大做