Archaic KJV Word
Garden
Modern equivalent: backyard
What Was Lost
The original temple. Eden was not just a nice park but the first sacred space -- the place where God's dimension and the human dimension overlapped perfectly, where God walked in the cool of the day, where humans worked alongside their Creator. Every temple after Eden was an attempt to recreate the garden. Gethsemane was a garden -- the new Adam chose obedience where the first Adam chose rebellion.
Closest Survivor in Modern English
garden (still used but the temple-of-God's-presence theology is entirely buried)
Peak Usage (1611)
KJV Genesis 2:8 -- 'The Lord God planted a garden eastward in Eden'; John 18:1 -- 'There was a garden, into the which he entered'
Died still used but domesticated (~1800)
Hebrew gan ('enclosed, protected, cultivated paradise/the meeting place of heaven and earth/where God walked with humans') domesticated into 'a plot where you grow tomatoes.'
What Replaced It
“yard”
Domestic landscaping; the garden was the original temple -- where God walked with humanity
“park”
Public recreation; Eden was a sacred, enclosed space where heaven and earth overlapped
“landscape”
Decorative; the garden was a working partnership between God and humans tending creation together