Nouns

The word 'one' is a noun, an adjective, and an indefinite pronoun. Example uses:

Noun: I only need one, you can have the other one.

Adjective: I can be there in one hour.

Pronoun: One of my students gave me a flower this morning.

Yes, the word idea is a noun, a common, singular, abstract noun; a word for the thought of something; any content of the conscious mind; a word for a thing.

Foreclosure is the noun variant for foreclose.

It can be, but is more usually a pronoun or an adjective meaning a large but non-specific number.

The word brave is a noun; brave is also and adjective (brave, braver, bravest) and a verb (brave, braves, braving, braved). Examples:

Noun: The brave are not those who aren't afraid, the are the ones who are afraid and do it anyway.

Adjective: The brave man jumped into the freezing river to pull the dog to safety.

Verb: You can brave one evening with my parents, they only come to town once a year.

yes

Yes, "news" is a thing, and therefore a noun.

The word experience is a noun. The plural is experiences.

The noun improvement can be a subject noun or an object noun; for example:

Subject: An improvement is needed in your study habits.

Object: That was an improvement.

Yes the word system is a noun. The plural form is systems.

Yes.

The word 'enjoyment' is an abstract noun as a word for pleasure that you get from an activity or experience; a word for an emotion.

It is an abstract noun.

The noun 'life' is an abstract noun, a word for a concept.

Yes, the word 'wonderland' is a noun; a word for a place that is filled with things that are beautiful, impressive, or surprising.

The noun forms of the verb to solve are solver and the gerund, solving.

Is undergone an abstract noun

• Delay word is an Abstract noun