They can be both.
Knowledgeable = able as a suffix
I am able to speak. = able as a verb.
Root words, prefixes, and suffixes are the elements used to form medical words. Prefixes are added to the beginning of a root word, and suffixes are added to the end. These elements can modify the meaning of the root word to create specific medical terms.
Root words are parts of words that the structure is based off of. Suffixes come after the root word. Both of these have meaning from the Greek and Latin language.
Prefixes: re-, sub-, un- Suffixes: -ment, -ing, -less
care = root word less = suffix
tear duct
Some examples of suffixes that change root words to nouns include "-tion" (e.g. celebration), "-ness" (e.g. happiness), and "-ment" (e.g. development).
come at the end and modify the meaning of the word root.
Prefixes; suffixes
Words with a prefix on the root word man are human and woman. Words with suffixes on the root word man are manhood, and man-cave. Other words with the root "man" include humanity, and womanhood.
englishforstudents.com under etymology
"Prop" is a root word, as it is the base form from which other words can be derived by adding prefixes and suffixes.
its a problem where you have trouble with wiriting,reading,learning suffixes root words and all that (i have disgraphia)