Cap, cape, cup, cupola....
The Türkic "container, vessel, box"....
The extant Dictionary definitions of Cap/cape/cup/cupola etc
1 n. - A small open container usually used for drinking; usually has a handle
2 n. - O.E. cĉppe "hood, head-covering," from L.L. cappa "a cape, hooded cloak,"
possibly shortened from capitulare "headdress," from L. caput "head" (see head).
Meaning "women's head covering" is c.1225 in Eng.; extended to men 1382. Of
cap-like coverings on the ends of anything (e.g. hub-cap) from c.1440. Meaning
"contraceptive device" is first recorded 1916. "Cap-shaped piece of copper lined
with gunpowder and used to ignite a gun" is c.1826; extended to paper version
used in toy pistols, 1872. The L.L. word apparently originally meant "a woman's
head-covering," but the sense transferred to "hood of a cloak," then to "cloak"
itself, though the various senses co-existed. O.E. took in two forms of the L.L.
word, one meaning "head-covering," the other "ecclesiastical dress" (see cape
(1)). In most Romance languages, a dim. of L.L. cappa has become the usual word
for "head-covering" (cf. Fr. chapeau) (The real Türkic source, or at least the
Etruscan
borrowing is not mentioned out of sheer modesty, or not to burden the tired
reader with superfluous details, I guess).
3 n - "garment," O.E. capa, from L.L. cappa "cape, hooded cloak" (see cap). The
modern word and meaning were a re-borrowing (1565) from Fr., from Sp., in
reference to a Sp. style (The real Türkic source, or at
least the Etruscan borrowing... etc).
4 n - cupola 1549, from L. cupula, dim. of cupa "cask, barrel"
(The real Türkic source, or at least the Etruscan borrowing... etc)
5 n - - etc.............