Let's tackle each part of your question step-by-step.
First, here are the words you provided:
List
rodent
instance
urgent
permanent
agrarian
fluent
entrant
violent
evident
assistant
serene
elegant
applicant
ancient
significant
magnificent
radiant
apparent
opponent
Now, let's sort the words that include 'ant':
entrant
assistant
elegant
applicant
significant
magnificent
applicant
opponent
Finally, complete these words with 'ent' or 'ant':
dog ent
ro dent
marg ent
re sistant
sin cent
appli cant
This exercise helps you understand how different suffixes are used in words and how they can change the meaning of the root word. Suffixes like 'ant' and 'ent' are commonly used in English and often describe a person or thing that performs a particular action or possess a particular trait.