AM

AM- is an Elvish root, with two different meanings.^[1]

AM¹-

Meaning: "mother"

• Quenya: amil or amme
• Ilkorin: aman (pl. emuin)

AM²-

Meaning: "up" (usually in form amba-)

• Quenya: am- ("up", prefix); amba ("up(wards)", adverb); amban ("upward slope, hill-side")
• Noldorin (Sindarin): am ("up"); am-bend, amben ("uphill"); amon ("hill"); am-rûn ("uprising, sunrise"; hence Quenya ambaron, "Orient" [cf. Ambaróna])

References

1. ↑ J.R.R. Tolkien, Christopher Tolkien (ed.), The Lost Road and Other Writings, "Part Three: The Etymologies", p. 348