calku -cak- gismu

x₁ is a shell/husk [hard, protective covering] around x₂ composed of x₃.

In notes:

bartu: x₁ is on the outside of x₂; x₁ is exterior to x₂.
gacri: x₁ is a cover/[lid/top] for covering/concealing/sheltering x₂.
korka: x₁ is a quantity of/contains/is made of cork/bark from tree/species x₂; [material].
pilka: x₁ is a crust/rind/peel/skin/hide/outer cover of x₂.
skapi: x₁ is a pelt/skin/hide/leather from x₂.
badgai: g₁ is a protective cover for b₂=g₂ against b₃.
cakyda'a: x₁=d₁ is an armoured fighter protected by armuor/shell x₂=c₁ covering x₃=c₂ of material x₄=c₃
cakyjukni: j₁ is a crustacean of species/class j₂.
gaimra: m₁=g₁ is a cover/[lid/top] for sheltering m₂=g₂ from danger/threat m₃.
selcalku: x₁ has a shell/husk/hard, protective covering x₂, which is composed of x₃.
tercalku: x₃=c₁ is a shell/husk/hard, protective covering around x₂=c₂ composed of x₁=c₃.
xasycakrespa: x₁ is a sea turtle of species x₂.