Words that have similar meanings.
a. synonym
b. antonyms
c. puns
d. friends

Words that have similar meanings are known as synonyms.

Synonyms = same
Antonyms = opposite
Puns = humorous word play 
Friends = companion

The Athenian political system included an assembly. The correct option among all the options that are given in the question is the first option or option "A". The other choices given in the question are incorrect and can be avoided. I hope that this is the answer that has actually come to your desired help.