bans, banns

Bans or bans is the third person singular ( he, she, it ) form of "ban",  meaning to prohibit or abolish--
If their church bans this book, they will go along with it.
Bans may also be the plural ( more than one ) of "ban", meaning a prohibition--
They violated the bans on nuclear testing agreed upon in the treaty.

Banns or banns ( rhymes with bans ) means a public notice of an intended marriage, as read in church--
The banns of marriage were read for the first time last Sunday.
Banns are usually read three times, in case anyone knows of an impediment to the marriage.

Now that you know that, you can say--
"If the minister bans the reading of the banns of marriage, they plan to attend church someplace else."

Note--"bands" ( nearly rhymes with bans ) may mean more than one band--
They are watching the marching bands on TV.
This bird has three bands on his leg.
"Bands" may also mean the third person singular ( he, she, it ) form of "band" meaning to group together ( people or creatures ), or to attach a band to--
See how the rabbit bands together for safety.
When he catches a bird, he bands its leg.