When you hear people say 'have a bath' or 'take a bath', what do you think? That one is correct and the other is not? Not at all.

They’re both correct, and here’s why:

In this context, 'bath' is always a noun in American English but both a noun and a verb in British English.

American

Americans naturally say 'take a bath' to mean 'wash oneself in a tub of water' and use 'bathe' as the verb form. They however use 'have a shower' when talking about a wedding shower, but not in the sense of cleaning the body.

Examples:

1. She was always the first to take her bath because she wakes early.
2. While he bathed, his wife called the police.


British

Britons naturally say 'have a bath' or 'bath' and 'bathe' is used to mean swim or pour liquid on.

Examples:

1. Don’t disturb me, I’ll take my bath in the afternoon.
2. If you bath them today, who will do it tomorrow?
3. It’s a new swimming pool for everyone to bathe.

englishnaija.com

I use both interchangeably without minding which is BE or AE.

chukxie:
I use both interchangeably without minding which is BE or AE.

Biko, time no dey