What part of speech is "above" in this sentence? Seen from above, the fields make a pattern of squares and oblongs.
Here it is a noun.
Preposition.
You are using the word "above" as a noun in your sentence. Specifically, you are using it as a predicate noun with the linking verb is. You can more easily see it when you manipulate the sentence and say, "Above" is what part of speech in this sentence? Here I am using it as a noun as well, but with the switch, it becomes the subject noun. Above usually is a preposition. Above About Across After Against...