Final answer:
A suffix is a group of letters added to the end of a word to change its meaning or function. The noun in the given words is 'tension'.
Step-by-step explanation:
A suffix is a group of letters added to the end of a word to change its meaning or function. A noun is a word that represents a person, place, thing, or idea. Looking at the given words, 'tension' is a noun because it represents a state of being stretched or strained.
Learn more about Suffixes in English words