What is a five letter suffix that would change the noun phrase to another noun?

There isn't a single five-letter suffix that universally changes a noun phrase into another noun. Suffixes work by adding specific meanings to existing words, and the resulting word class depends on the base word and the suffix.

Here are some examples of suffixes that might change a noun phrase into another noun, but none are exactly five letters:

* -ness: This suffix often turns adjectives into nouns (e.g., "happy" becomes "happiness").

* -ship: This suffix indicates a state, condition, or quality, often related to a particular role or relationship (e.g., "friend" becomes "friendship").

* -hood: This suffix denotes a state or condition, often associated with a stage of life (e.g., "child" becomes "childhood").

You'll need to consider the specific noun phrase you're working with to determine the most appropriate suffix (if any) to transform it into another noun.