Rare
Part of speech: adjective
Definition: Very uncommon; scarce. Cooked very lightly, so the meat is still red (in the case of steak or beef in the general sense).
Part of speech: verb
Definition: To rear, rise up, start backwards. To rear, bring up, raise.
Example sentence: Simplicity - that's what I want. It's been a rare commodity for me for a number of years, but I enjoy being able to hang out with my girl, read the newspaper, and sit back and start to read a book by someone I admire, like Lawrence Krauss or Christopher Hitchens. And that's it - simplicity, where the game of Hollywood doesn't exist.
Uncommon
Part of speech: adjective
Definition: rare; not readily found; unusualremarkable; exceptional
Example sentence: Foul-ups in testing are not uncommon, especially when the test setup is being tried for the first time.