The coolness of words

Life isn't fair for words: some are just cooler than others. It occurs to me that it would be useful in marketing to have some solid data on what words are cooler than others.

Google isn't a lot of help. Here are some hit returns from Google (I'll leave it up to you to decide which is the cooler):

Accountant 55.9m
Astronaut 22.7m

Tax 735m
Cash 639m

Sword 124m
Lightsaber 5.6m

How to get this data? Perhap look at the frequency of the word's use on sites focused on entertainment rather than those focused on business (and other serious endeavours)? Or perhaps look at the word's frequency on Twitter (likely to be more "cool" than business)?

Also, it would be useful to assess phrases or word combinations, e.g. "mission accomplished".

...and on the pirate vs ninja debate:

Pirate 112m
Ninja 253m....