Final answer:
The words that contain a suffix are amplify and encode.
Step-by-step explanation:
The words that contain a suffix in the given options are amplify and encode. A suffix is a word part that is added to the end of a base word to change its meaning or function. In the word 'amplify', the suffix is '-ify' which changes the base word 'ampli' into a verb meaning 'to make larger or louder'. In the word 'encode', the suffix is '-code' which changes the base word 'en' into a verb meaning 'to convert into code'.
Learn more about Suffixes in English words