The suffix "-ity" can be added to make prosper a noun, resulting in "prosperity."
The suffix "er" can be added to offend to make it a noun, resulting in "offender."
-ability can be added to conceive to make conceivability, which is a noun. Conceivableness is also a noun.
There could be im- prefix added, to make impolite, as in not polite.
The suffix that can be added to "determine" to make it a noun is "-ation," resulting in the noun "determination."
When the suffix "ize" is added to the noun "general," the word becomes "generalize," which means to make a general statement or form a general conclusion.
-ability can be added to conceive to make conceivability, which is a noun. Conceivableness is also a noun.
-ability can be added to conceive to make conceivability, which is a noun. Conceivableness is also a noun.
+er can be added to make it a noun.
The suffix that can be added to "determine" to make it a noun is "-ation," resulting in the noun "determination."
When the suffix "ize" is added to the noun "general," the word becomes "generalize," which means to make a general statement or form a general conclusion.
There could be im- prefix added, to make impolite, as in not polite.
One example of a five letter suffix that could change a noun phrase to another noun is "-hood." For instance, adding "-hood" to "child" creates "childhood."
-ion
To turn "exclaim" into a noun, you can add the suffix "-ation" to make it "exclamation."
When a suffix is added to a word from the first group, the "er" can sometimes change to an "or" depending on the word and the rules of spelling. For example, "sing" becomes "singer" and "run" becomes "runner."
When the suffix -itis is added to a word, it typically forms a noun. For example, "dermatitis" is a noun meaning inflammation of the skin.
-ness is a noun-forming suffix added to adjectives. it can't be added to the noun "friend". -ly (an adverb--or adjective forming suffix) could be added to "friend" but not to the nonword "friendness". hope this helps! :)