She is the youngest person in the class. the suffix in the italicized word in the sentence above is:

The italicized word in the sentence above is "youngest". The suffix of this word is "-est" connected to the root word "young". A suffix is a morpheme that is linked at the end of the word in order to form a new word with a new meaning. The suffix -est indicates the superlative degree of comparison of the adjective.

The women's association, because women is the plural form of woman, and 's shows possession.