different between rearmost vs backmost

English

rear +? -most

rearmost

Furthest to the rear.
The rearmost member of the strike team walked backward to guard them from a surprise attack from behind.

back +? -most

backmost (not comparable)

farthest back
- 1922, Thomas Hardy, Late Lyrics and Earlier
  This [hobby] was to delve at whiles for easel-lumber, / Stowed in the backmost slums of a soon-reached city, / Merely on chance to uncloak some worthy canvas, […]

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