Drab Habitation of Whom — Mushroom

Dickinson's poems usually seal a second meaning, which will be her true intention. Mushroom fits this poem's description, and school a some place she liked not.

Drab Habitation of Whom?
Tabernacle or Tomb－
Or Dome of Worm－
Or Porch of Gnome－
Or some Elf's Catacomb?

(F.916/J.893)

[1] Drab:: dull color of some poisonless mushrooms.
[2] Tabernacle or Tomb:: the shape when look from above.
[3] Dome:: a round cap.
[1-5] Whom, Tomb, Worm, Gnome, Catacomb:: five words with om to hint at mushroom.
[1-5] Habitation, Tabernacle, Dome, Porch, Catacomb:: all words related to space, room in mush-room.

School
[1] Drab Habitation:: a dull place, a (Christian) school.
[2] Tabernacle or Tomb:: the body with no soul or like the dead, as elfish students in a class.
[3] Dome of Worm:: work-like students in a stately building.
[4] Porch:: the Stoic school, the Stoic philosophy _{(OED 4)}. Gnome:: a short pithy statement of a general truth; a proverb, maxim _{(OED 1)}.
[5] Elf's Catacomb:: a burial place for imps, urchins.