jmdict 1664420 Active (id#2320712)
止まり木； 留まり木 [rK] ； とまり木 [sK] ； 止り木 [sK] ； 留り木 [sK]
【 とまりぎ 】
  1. [n]
    • perch
  2. [n]
    • barstool
History:
    • A 2024-11-09 16:46:33 Stephen Kraus (id#2320712)
    • Comments
      We use the [rK] tag for forms that are rare due to a particular kanji usage rather than a particular okurigana usage.
    • Diff
      @@ -8,7 +7,0 @@
-<keb>とまり木</keb>
-</k_ele>
-<k_ele>
-<keb>止り木</keb>
-<ke_inf>&rK;</ke_inf>
-</k_ele>
-<k_ele>
@@ -18,0 +12,8 @@
+<keb>とまり木</keb>
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>止り木</keb>
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
@@ -20 +21 @@
-<ke_inf>&rK;</ke_inf>
+<ke_inf>&sK;</ke_inf>
    • A* 2024-11-09 16:18:38 Sombrero1 (id#2320704)
    • Refs
      Google N-gram Corpus Counts
╭─ーーーー─┬────────┬───────╮
│ 止まり木 │ 93.367 │ 74.0% │
│ とまり木 │ 22.588 │ 17.9% │
│ 止り木　 │  4.086 │  3.2% │[rK] ; daijs/r, oukoku, iwakoku etc.
│ 止木　　 │    596 │  0.5% │Remove, different word?
│ 留り木　 │    387 │  0.3% │add, [rK] ; Shinsen only as far as I can see, but still yields many search results
│ 留まり木 │    379 │  0.3% │add, [rK] ; Prog, Shinsen
│ とまりぎ │  4.828 │  3.8% │
╰─ーーーー─┴────────┴───────╯
Do 留り木 and 留まり木 make it? Or should they be [sK]?

Also 止木 is not in my refs for 止まり木.
Seems to be a different word:

大辞泉

   とめ‐ぎ【止（め）木・留（め）木】

      ①物を固定させるための木。
      ②江戸時代、山林の保護のため、切ることを禁じられていた木。停止木（ちようじぼく）。

╭─ーーー─┬───────┬───────╮
│ 留木　 │ 1.969 │ 63.1% │Probably duplicates
│ 止木　 │   596 │ 19.1% │
│ 止め木 │   343 │ 11.0% │
│ 留め木 │   211 │  6.8% │
╰─ーーー─┴───────┴───────╯

留木 also has another meaning, which is already on JMdict.
    • Diff
      @@ -11,0 +12 @@
+<ke_inf>&rK;</ke_inf>
@@ -14 +15,6 @@
-<keb>止木</keb>
+<keb>留まり木</keb>
+<ke_inf>&rK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>留り木</keb>
+<ke_inf>&rK;</ke_inf>
    • A* 2024-11-09 15:40:46 (id#2320703)
    • Diff
      @@ -5,0 +6,3 @@
+</k_ele>
+<k_ele>
+<keb>とまり木</keb>
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