What part of speech is "but" in the sentence "Our grass seems to grow rapidly, but your grass does not?"

In the sentence "Our grass seems to grow rapidly, but your grass does not," the word "but" functions as a conjunction. Conjunctions are words that connect clauses, sentences, or words in the same clause. In this case, "but" is joining two independent clauses: "Our grass seems to grow rapidly" and "your grass does not." The use of "but" indicates a contrast between the two statements, emphasizing the difference in growth between the two types of grass.

For this reason, "but" serves a specific grammatical purpose as a conjunction that links ideas while also suggesting a relationship between them—specifically opposition or contrast.