Life is an idea
greater idea = better idea A thing that has a greater thing, is called "better". A thing that has no greater, is called "best" or "superlative".
A word for a person, place, thing or idea is a noun.
Yes, the word life is a noun, a singular, common noun, abstract noun. An 'idea noun' is an abstract noun, a word for something that can't be experienced by any of the five senses, it can't be seen, heard, smelled, tasted, or touched. The life of someone or something is a thing that is known or understood, an 'idea'.
It is not the most important thing in life but it is a good idea because in an accident it might involve swimming to survive.
happiness is an idea
Because a noun is a person, place, thing or idea. A song is an idea that you make into a thing.
I have no idea what that thing is.
The noun time is an abstract thing, a word for a concept, an 'idea noun'.
Place
Qualification a place is a thing not an idea because it refers to the attribute that a person has to meet to get something.
the idea of work is the thing that likes forceXdistance/displacement
A tornado is a natural phenomenon characterized by a rotating column of air. It is neither a person, place, thing, nor an idea.