What happens to a noun when you add suffixes such as like -ous -ly or ish?

When you add suffixes like -ous, -ly, or -ish to a noun, you are usually modifying the noun to create a new adjective that describes a quality or characteristic of the original noun. For example, "joy" becomes "joyous" (full of joy), "quick" becomes "quickly" (in a quick manner), or "child" becomes "childish" (characteristic of a child).