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.
He says that the tree had been dying.
Answer:
it creates a scary mood by describing how a climbing roller coaster sounds
A: a source that’s cited in another source
