I'm looking for one single word (noun) that would be used for something as valuable (or invaluable) as life or the ability to breathe any help?

closed as primarily opinion-based by tchrist Aug 20 '17 at 10:41

Many good questions generate some degree of opinion based on expert experience, but answers to this question will tend to be almost entirely based on opinions, rather than facts, references, or specific expertise. If this question can be reworded to fit the rules in the help center, please edit the question.