https://en.wikipedia.org/wiki/Limnoria_lignorum
GG5 and other JEs only have sense 2.

I think 蠹 could be sK.

@@ -53,0 +54,2 @@
+<gloss>grain borer</gloss>
+<gloss>wood borer</gloss>

蠧 (士 on top) is an itaiji for 蠹 (士 + 口 on top).
The kanken people (kanjipedia) say this word can be written with the kanji by itself.
https://www.kanjipedia.jp/kotoba/0005127100
https://www.kanjipedia.jp/kotoba/0006472200

〈木／き／キ〉〈食（い）／喰（い）／蠧／蠹／くい／クイ〉〈虫／むし／ムシ〉／蠧／蠹

Google N-gram Corpus Counts
╭─ーーーーー─┬───────┬───────╮
│ 木食い虫　 │   510 │  6.3% │
│ 木食虫　　 │    50 │  0.6% │ - ... ... (daijirin, smk, kanjipedia)
│ 木蠹虫　　 │     0 │  0.0% │ - add, rK (kanjipedia)
│ 蠹　　　　 │   825 │ 10.1% │ - add, rK (kanjipedia; I doubt the n-gram counts are usages of this word)
│ 木喰い虫　 │   308 │  3.8% │ - add, sK
│ 木喰虫　　 │   169 │  2.1% │ - add, sK
│ 木蠧虫　　 │     0 │  0.0% │ - ...  sK (daijirin, but this is an itaiji form)
│ 蠧　　　　 │   325 │  4.0% │ - add, sK (itaiji)
│ きくい虫　 │   390 │  4.8% │ - add, sK
│ キクイ虫　 │   200 │  2.5% │
│ 木くい虫　 │    55 │  0.7% │
│ キクイムシ │ 5,224 │ 64.1% │
│ きくいむし │    99 │  1.2% │
╰─ーーーーー─┴───────┴───────╯

@@ -10,0 +11,16 @@
+<keb>木蠹虫</keb>
+<ke_inf>&rK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>蠹</keb>
+<ke_inf>&rK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>木喰い虫</keb>
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>木喰虫</keb>
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
@@ -11,0 +28,9 @@
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>蠧</keb>
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>きくい虫</keb>
+<ke_inf>&sK;</ke_inf>
@@ -26,0 +52 @@
+<misc>&uk;</misc>