Quenya 

umba

umba

[umba, umbacarin adj. unknown meaning relating badness (PE17:172)]

umba

swarm

umba noun "swarm" (VT48:32)

umba

noun. swarm

A word for “swarm” in notes from 1968 based on the root √UM “abound” (VT48/32).

Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. imbile “swarm, flock” under the early root ᴱ√IBI “to swarm”, said to often apply to groups of small birds (QL/41).