diff --git a/src/app/features/search/search-ranking.spec.ts b/src/app/features/search/search-ranking.spec.ts
index 85d3423..93d2774 100644
--- a/src/app/features/search/search-ranking.spec.ts
+++ b/src/app/features/search/search-ranking.spec.ts
@@ -81,6 +81,11 @@ describe('rankSearchResults', () => {
     expect(rank(entries, 'Proxima')[0]).toBe('Proxima Centauri');
   });
 
+  it("lists a host's own planets ahead of the systems whose names run on from its own", () => {
+    const entries = [star('K2-18'), star('K2-180'), star('K2-181'), exoplanet('K2-18 b'), exoplanet('K2-18 c')];
+    expect(rank(entries, 'K2-18')).toEqual(['K2-18', 'K2-18 b', 'K2-18 c', 'K2-180', 'K2-181']);
+  });
+
   it('breaks remaining ties by name length, then alphabetically', () => {
     const entries = [exoplanet('Kepler-1292 b'), exoplanet('Kepler-9 c'), exoplanet('Kepler-9 b'), exoplanet('Kepler-15 b')];
     expect(rank(entries, 'Kepler')).toEqual(['Kepler-9 b', 'Kepler-9 c', 'Kepler-15 b', 'Kepler-1292 b']);
diff --git a/src/app/features/search/search-ranking.ts b/src/app/features/search/search-ranking.ts
index d5f207c..6a86db0 100644
--- a/src/app/features/search/search-ranking.ts
+++ b/src/app/features/search/search-ranking.ts
@@ -28,6 +28,13 @@ export function entrySubtitle(entry: SearchEntry): string {
  * prefix match, and so on, so a better kind of match can never be crowded out by a worse one.
  */
 const MATCH_EXACT = 4;
+/**
+ * A prefix that ends where a word does, "kepler-186 f" for "kepler-186", ahead of one running on into
+ * the same word, "kepler-1860". Level with it, the star outranked the planet on kind, and once the
+ * archive's hosts became stars, searching a host's name listed K2-180 to K2-186 and none of K2-18's
+ * planets: 325 hosts lost some of their own planets from the eight rows shown, and now 50 do.
+ */
+const MATCH_WORD_PREFIX = 3.5;
 const MATCH_PREFIX = 3;
 const MATCH_WORD_START = 2;
 const MATCH_SUBSTRING = 1;
@@ -89,7 +96,7 @@ function scoreIndexed(indexed: IndexedSearchEntry, normalizedQuery: string, comp
     return MATCH_EXACT;
   }
   if (indexed.normalizedName.startsWith(normalizedQuery)) {
-    return MATCH_PREFIX;
+    return WORD_SEPARATORS.test(indexed.normalizedName.charAt(normalizedQuery.length)) ? MATCH_WORD_PREFIX : MATCH_PREFIX;
   }
   if (indexed.words.some((word) => word.startsWith(normalizedQuery))) {
     return MATCH_WORD_START;