A word appearing as ᴱQ. liantasse “vine” in the Qenya Lexicon of the 1910s, an elaboration of ᴱQ. liante “tendril” under the early root ᴱ√LI+ya “unite many as one” (QL/53).
Neo-Quenya: The later root ᴹ√SLIG was the basis for words like ᴹQ. liante “spider” and ᴹQ. lia “fine thread, spider filament”, so I think ᴺQ. liantassë “vine” can be salvaged as a derivative of this root, perhaps originally meaning “✱an entwining”. This word was used for “vine” in Helge Fauskanger’s NQNT (NQNT).
A verb appearing as ᴱQ. lia- “entwine” in the Qenya Lexicon of the 1910s derived from ᴱ√LI+ya “unite many as one” (QL/53).
Neo-Quenya: I think this verb can be retained for purposes of Neo-Quenya as a derivative of the later root ᴹ√SLIG.