Answer:
metaphor.......................
Brutus: What means this shouting? I do fear the people choose Caesar for their king.
It means that even it everyone is doing something wrong, it is not right. It is referring to peer pressure, don't do something just because everyone else it doing it.
It might be clearer to say: According to the dictionary, a squawk is not the same thing as a squeak. there's no need for them to be plural in your sentence and it's likely that, in the dictionary, they're listed as "squeak" and "squawk" singularly. when describing dictionary definitions it's best to use the form of the word that the dictionary uses for clarity.