Latin word order is usually very different from that in English.
Literally the sentence means Greed [cupiditas] is [est] the root [radix] of evils [malorum]. This is usually translated more freely...
"EST" est...
You'll have to be more specific. "Est" is Latin for "is" (it is, he is, she is, 'etc.). EST could also stand for many things, such as Eastern Standard Time, or European Summer Time. More...
An example of similes in Dulce Decorum Est is in the first line: 'Bent double, like old beggars under sacks' this suggests that soldiers are so tired that they can be compared to old beggarsHope that...