drudi -rud-dru- gismu

x₁ is a roof/top/ceiling/lid of x₂.

(cf. bitmu, stedu, galtu, gapru, loldi, marbi, gacri, mapku; a drudi is (designed to be) over/above something and shelters it from other things above the drudi, mapku)

jbovlaste

In notes:

bitmu: x₁ is a wall/fence separating x₂ and x₃ (unordered) of/in structure x₄.
gacri: x₁ is a cover/[lid/top] for covering/concealing/sheltering x₂.
galtu: x₁ is high/up/upward in frame of reference x₂ as compared with baseline/standard height x₃.
gapru: x₁ is directly/vertically above/upwards-from x₂ in gravity/frame of reference x₃.
loldi: x₁ is a floor/bottom/ground of x₂.
mapku: x₁ is a cap/hat/crown/helmet/piece of headgear [head-top garment] of material x₂.
marbi: x₁ is a shelter/haven/refuge/retreat/harbor for/protecting x₂ from danger/threat x₃.
stedu: x₁ is a/the head [body-part] of x₂; [metaphor: uppermost portion].
boldi'u: d₁ is a dome/cupola for purpose d₂.
drukorni'a: x₁=k₁=n₁ (individual or mass) is the eave of roof x₂=k₂=n₂=d₁
drutapla: t₁ is a roof tile of material t₂, shape t₃, thickness t₄.
koidru: k₁ is an overhanging portion of roof d₁=k₂, which is a roof of d₂.