The first clue, "Cherry", can already form "Cherry trees (these are all known for their hardwood)." That is a useful start, but LinkedIn Pinpoint still needs a repeatable pattern before the answer is safe.
The second clue, "Walnut", gives the pattern its shape: "Walnut trees (these are all known for their hardwood)" uses the same hidden word. At this point, the clue set is no longer just about a broad theme; it is testing whether each clue can attach to "trees (these are all known for their hardwood)."
The third clue, "Ebony", is the pivot because "Ebony trees (these are all known for their hardwood)" is a direct phrase. It confirms that Cherry, Walnut, Ebony, Oak, and Maple are behaving like compound-word clues, not five unrelated nouns.
The fourth clue, "Oak", and final clue, "Maple", finish the lock with "Oak trees (these are all known for their hardwood)" and "Maple trees (these are all known for their hardwood)." The same hidden word survives every reveal, which is exactly the kind of connection Pinpoint rewards.
Read together, Cherry, Walnut, Ebony, Oak, and Maple point to "Types of trees (these are all known for their hardwood)" because they form Cherry trees (these are all known for their hardwood), Walnut trees (these are all known for their hardwood), Ebony trees (these are all known for their hardwood), Oak trees (these are all known for their hardwood), and Maple trees (these are all known for their hardwood). That is why "Types of trees (these are all known for their hardwood)" is the best fit for LinkedIn Pinpoint #630.