Answer:
Polis was a city state in ancient Greece, it was sort of where philosophy was invented. The literal meaning of the word 'polis' translated to english is 'city'
Acropolis is a structure in ancient greece, typically built on a hill, and heavily fortified.
Agora is an open public space that was usually used for gatherings and markets in ancient greece.
Hoplite is a foot soldier of ancient greece. They bore heavy shields and spears. You've probably seen cartoons and movies with them in it. They had the red feather mohawk on their helmets. They had a very unique fighting style, they'd line up in rows, put their sheild in front of them, and stick the spear upward and out in front, then they'd charge at the enemy. It worked pretty well for them, and it is still used today, not in war, but police use it.
Phalanx is essentially what I explained above about the ancient greek fighting style. The phalanx is the formation the greeks took up in battles, one big mass of heavily armed hoplites.
Democracy was, I believe, invented by the greeks, I forget if that's true, do NOT take my word on that. Anyway, democracy is a system of government where the citizens get to choose their legislation.
Oligarchy is what it's called when a country or an organization have total control of everything. So, for example, if you're stuck on a deserted island with 50 other people, but the 5 oldest have complete control of everything, making them a council of elders, then that would be an oligarchy. The leaders don't have to be old though, I just like councils of elders.
Helot is somone in ancient greece who is a little more than a slave, but no quite deemed a citizen. Helots made up a lot of the population in sparta territories.
And last but not least, and Ephor is a leader of the sparta in the ancient greece cities of heraclea and taras.
Explanation:
I really hope this helps!