> Proper nouns are not included, except those also used as common nouns, like Newton
It has Pyrex, but just says it's an invented word.
Pyrex is invented, but comes from Pyro (Fire) + Rex (King), which makes the use of it for heat proof glass easier to understand.
The new Google feature is really neat. I'm uneasy about these things being built into Google rather than Google pointing people to other websites.