Final answer:
In the provided sentence, 'pilot' and 'airplane' are common nouns. These words refer in a general sense to anyone who pilots an airplane and any airplane, respectively. They are not specific to one particular entity.
Step-by-step explanation:
In the sentence you provided, both pilot and airplane can be classified as common nouns. A common noun refers to a general name for people, places, things, or ideas. It's not specific to one particular entity. For instance, 'pilot' refers to any person who steers an airplane; it's not a specific individual. Similarly, 'airplane' could refer to any type of airplane; it doesn't identify one specific airplane. Therefore, these words are used as common nouns in this context.
Answer: Pilot,airplane
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