Final answer:
The word 'thick' is an example of an adjective.
Step-by-step explanation:
In the sentence 'Some hamburgers are made with thick slices of bacon,' the word 'thick' is an example of an adjective. Adjectives describe or modify nouns, and in this case, 'thick' describes the slices of bacon. Adjectives provide more information about the noun they are associated with, such as its size, color, or quality.
Learn more about Parts of speech