or

preposition/prefix. above, above; [G.] onto, on top, on

A preposition and prefix in The Etymologies of the 1930s glossed “above” and derived from the root ᴹ√ORO “up; rise; high” (Ety/ORO).

Conceptual Development: The Gnomish Lexicon of the 1910s had adverb G. or “on, on top” which could be used as a preposition meaning “on, onto” (GL/63), clearly also derived from ᴱ√ORO. As a prefix, G. or- meant “on, onto, up, in addition to, etc.” (GL/62).

Neo-Sindarin: For purposes of Neo-Sindarin I would only use or as an adverb/preposition/prefix for “above [not necessarily touching]”, while for “on [top of]” I would use S. po.