吧

ba

1. (modal particle indicating suggestion or surmise)
2. ...right?
3. ...OK?
4. ...I presume.

bā

1. bar (loanword) (serving drinks, or providing Internet access etc)
2. to puff (on a pipe etc)
3. (onom.) bang
4. abbr. for 貼吧|贴吧[tie1 ba1]

biā

1. (onom.) smack!