So you get words like amphibian (because it lives both in and out of water), amphibious,(suited to both land and water), amphipod (because it has both jumping and swimming feet), amphora (jar with two sides).

Most of the other words like this are quite specialised and just take up one column in a dictionary.

amphibole. amphibology. amphibrach. amphimixis. amphipathic. amphiprotic. amphisbaena. amphiscian. amphistomous.

Addendum – I’ve checked several print and online dictionaries, and there seems to be no other word starting with ‘amph’ that has the same meaning. There aren’t even 13 words of any kind meaning that kind of theater. Either you’re misreading the assignment or your teacher is an idiot.

amphitheater

…how can there be 13 words that all start with “amph” that have the same definition??

amphtheater

meaniful

meanie

meaniless

meaner

meanest

meanful

mean[math]

ummmm

sorry 9 is good right?

amphitheatric

amphitheatrical

amphitheatrically

amphibians

amphipod

amphigory

amphipathic

amphora

amphetamine

…..dictionary