Note: Reply moved, for better fit, from https://hermeneutics.stackexchange.com/posts/32797/edit
Interesting catch of the two forms in one verse (Ruth 1:6). In doing a study last night and this morning, I began to see an underlying distinct pattern.
Possible connection between Sarai/Sarah?
ShRI - Sarai - the barren one.
ShRH - Sarah - fruitful/fertile one.
ShDI - barren field ?
ShDH - fruitful plain ?
Naomi turned from shdi of Moab and then 'heard' in shdh of Moab that Yahweh gave bread to Beth-Lehem.
In many cases, there is another distinction between beasts and animals:
"Beast (bhmth) of shdi"
"Animal (chith) of shdh"
(Found two exceptions thus far – one was 1Sam. 17:44 – bemth of shdh)
Did not recall Moab being divided, so did a Google search. Rather than two divisions, there appears to be three.
Tenatively, will use field-shdi / plain-shdh / artz-land of (as incorporating both) of Moab. Wilderness is mdbr.
The land of Moabites
Their territory of Moab was divided into three parts, one of them
being the field of Moab. This portion was enclosed by natural
fortification and was bounded by the gorge of Amon River by the North,
the Dead Sea cliffs on the south and a semicircle of hills on the east
and south. The next one was the Land Of Moab, which was a more open
country that extended from the Amon north to the hills of Gilead. The
third portion was the plains of Moab, a ‘sunken’ district in the
tropical depths of the Jordan River.
The territory occupied by Moab at the period of its greatest extent,
before the invasion of the Amorites, divided itself naturally into
three distinct and independent portions:-- (1) The enclosed corner or
canton south of the Arnon was the "field of Moab." ( Ruth 1:1 Ruth 1:2
Ruth 1:6 ) etc. (2) The more open rolling country north of the Arnon,
opposite Jericho, and up to the hills of Gilead, was the "land of
Moab." ( 1:5 ; 32:49 ) etc. (3) The sunk district in the tropical
depths of the Jordan valley. (Numbers 22:1 ) etc.