They add a descriptive aspect to the noun which they refer to. This could help distinguish between different possible things: the tall man v the short man.
Important
the word importance is a noun. Important will be the adjective
The adjective form is important.
The abstract noun form for the adjective important is importance.
Important is an adjective. The related noun is importance.
important
petty (adjective) - of little or no importance or consequence.
"Important" is an adjective.
Important is the adjective form. The noun is importance and the adverb form is importantly.
The abstract noun form for the adjective important is importance.
In French like in English, the related name for the adjective important is "importance". Importance is a feminine noun in French.
The word 'important' is an adjective, not a noun.The adjective 'important' is a word used to describe a noun (an important day, an important assignment).The noun related to the adjective 'important' is importance.
It is of utmost importance to understand what plagiarism is when attempting to provide the quintessential answer.