One of these things is not like the others, One of these things just doesn't belong, Can you tell which thing is not like the others By the time I finish my song?
Arctic, arc-tic
Root word arc- "vaulted space" (as arcado from 1640s), via French arcade, which probably is from Italian arcata "arch of a bridge," from arco "arc," from Latin arcus "a bow, arch"
Root word tic- relating to a process or state. A rus-tic setting is rural or placed in the country.
So antarctic would be not related to the vaulted space.
Archeology
Arch angels
Arc of the covenant
Archdiocese
The Gateway Arch hovers over the old cathedral