What word is synonyms for the customs?

There isn't one single word that perfectly captures all the nuances of "customs." It depends on the context you're using it in. Here are some possible synonyms depending on the meaning:

For traditions and practices:

* Traditions

* Manners

* Habits

* Folkways

* Rituals

* Conventions

* Practices

For customs at the border:

* Border control

* Immigration

* Inspection

* Duty

* Tariff

For social customs:

* Etiquette

* Social norms

* Social practices

* Usage

For something unusual or peculiar:

* Idiosyncrasy

* Eccentricity

It's important to consider the specific context to choose the most appropriate synonym.