I'm keeping 捺落 visible and tagged as rare since it's in kokugos. That's the usual practice. I wouldn't bother with the others, but they're hidden.

@@ -13 +13 @@
-<ke_inf>&sK;</ke_inf>
+<ke_inf>&rK;</ke_inf>

https://kotobank.jp/word/奈落-108572
nipponika 奈落
地獄の意。サンスクリットのナラカnarakaの音訳語で、那落迦、捺落迦、那羅柯とも記す。漢訳では地獄のほか、悪道、不可楽、不可救済、非行、闇冥(あんみょう)と訳す。

奈落	220039	99.8%
那落	268	0.1%
奈落迦	83	0.0%
捺落	0	0.0%
那落迦	0	0.0%
捺落迦	0	0.0%
那羅柯	0	0.0%

https://ja.wikipedia.org/wiki/地獄_(仏教)
奈落迦[2]、那落迦、捺落迦、那羅柯などと音写される[1]。

sankoku has only the first term

From sanskrit サンスクリットのナラカnaraka, these all seem to be based on phonetic readings.

Quite a lot of kanji trivia here. Someone actually stuck 那落 on a book cover or something though.

捺落 is just a variant/obsolete kanji of 奈落, I can't imagine it's a huge loss even if daijs notes it. Gonna swing for the fences and [sK] it.

When I do an image search for 捺落, I don't actually get 捺落, I get the full form: 捺落迦. Seems like it was a poetry collection long ago too? (nikk).

@@ -8,0 +9 @@
+<ke_inf>&rK;</ke_inf>
@@ -11,0 +13,17 @@
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>奈落迦</keb>
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>捺落迦</keb>
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>那落迦</keb>
+<ke_inf>&sK;</ke_inf>
+</k_ele>
+<k_ele>
+<keb>那羅柯</keb>
+<ke_inf>&sK;</ke_inf>

gg5
https://en.wikipedia.org/wiki/Parts_of_a_theatre#Backstage_or_offstage

The JEs have "trap cellar" but that doesn't appear to be a common term.

@@ -21,2 +21,2 @@
-<gloss>hell</gloss>
-<gloss>hades</gloss>
+<gloss>Hell</gloss>
+<gloss>Hades</gloss>
@@ -33,2 +33,2 @@
-<gloss>theatre basement</gloss>
-<gloss>theater basement</gloss>
+<gloss>trap room (of a theatre)</gloss>
+<gloss>below-stage basement</gloss>

Daijr: "梵 naraka"

@@ -18,0 +19 @@
+<lsource xml:lang="san">naraka</lsource>