A suffix is a group of letters added to the end of a word to change its meaning or grammatical function.
Here are some examples:
* -ing: Adding "-ing" to a verb creates the present participle (e.g., "walk" becomes "walking")
* -ed: Adding "-ed" to a verb creates the past tense (e.g., "walk" becomes "walked")
* -ly: Adding "-ly" to an adjective creates an adverb (e.g., "happy" becomes "happily")
* -er: Adding "-er" to a noun or verb can create a comparative adjective (e.g., "tall" becomes "taller") or a noun referring to someone who does an action (e.g., "teach" becomes "teacher")
So, yes, adding one or more letters as a suffix can definitely create a new word.