Setting up random words in for array and adding as environment variable to use for other requests

New to APIs/Postman
1

Hi,
have a doubt with setting up random values to environment level and use it.
Actually I wanted to add a random word in place of name and namekey and set it in environment level. So I have attached the code. But it’s going as undefined error always. I am not if I can do this with the below code. So my body is always dynamic so I want to generate random words/word, whenever it runs and set it and use it for other request. So that always I can have new values without input.Thanks in advance,

POST body :

[
{
“name”: “{{categoryName}}”,
“nameKey”:"{{categorynameKey}}"
}
]

Code : Pre-request Script

var random1="{{$randomLoremWords}}";

var random2="{{$randomLoremWord}}";

var categoryName=pm.environment.get(“name”) + random1

console.log(categoryName);

var categorynameKey=pm.environment.get(“nameKey”) + random2

console.log(categorynameKey);

pm.environment.set(“caetegoryName”, data[0].categoryName);

pm.environment.set(“categorynameKey”,data[0].categorynameKey);