Informal:
* Chat: This is the most common and versatile term.
* Talk: This can be used in a general way, but is also sometimes used to refer to a more serious conversation.
* Chinwag: A more informal and playful term.
* Gab: This is usually used to refer to a casual, friendly conversation.
* Natter: Similar to "gab" but often used for a longer, more detailed conversation.
* Yarn: This is usually used to refer to a story or anecdote.
* Shoot the breeze: This refers to a casual, relaxed conversation.
* Have a word: This suggests a conversation that is intended to be private or serious.
More specific:
* Have a go: This implies a confrontation or an argument.
* Give someone a piece of your mind: This is a more aggressive way of saying you're going to talk to someone about something they did wrong.
More slangy:
* Have a chinwag: This is similar to "chat," but more informal.
* Have a heart-to-heart: This implies a deep, emotional conversation.
* Spill the beans: This means to share a secret or reveal information.
* Get the lowdown: This means to find out all the information about something.
The best word to use will depend on the specific situation and the tone you want to convey.