Netgear wordlist building

Hi guys,

I was told that some Netgear routers default passwords have a definable pattern.
They are two 4 to 6 letter words followed by 3 digits, such as 'purpleshoe763' or 'niftyplanet321'.
The verbs and adjectives are always first, and the nouns are always second (makes it easy for people to remember).

How would you create such a wordlist ?
Getting a dictionary of all english adverbs, and a dictionary of all english nouns, then mix all together ? And then add 000-999 for each...

That's billions-billions-billions of combinations right ? Impossible to do ?

Thanks.