What is a synonym for greeting?

Here are some synonyms for greeting, depending on the context:

Formal:

* Salutation

* Welcome

* Address

* Acknowledgement

Informal:

* Hello

* Hi

* Howdy

* Good morning/afternoon/evening

* Cheers

* Sup

Other:

* Nod

* Wave

* Handshake

* Hug

* Kiss

* Bow

The best synonym for "greeting" depends on the specific situation and the desired tone.