Qenya
amba
adverb. up(wards)
ama
adverb. up
namba
noun. hammer
lamba
noun. hammer
am-
prefix. up
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A noun for “a hammer” in The Etymologies of the 1930s under the root ᴹ√NDAM “hammer, beat” (Ety/NDAM). Tolkien wrote an l/ above this word, possibly indicating a variant form lamba (EtyAC/NDAM). This variant is consistent with the alternate form of the root: ᴹ√DAM (EtyAC/NDAM). I would stick to namba “hammer” for purposes of Neo-Quenya.
Conceptual Development: The Qenya Lexicon of the 1910s had ᴱQ. artan (artam-) or tartan “hammer” (QL/32), the second variant also appearing with a stem form tartam- under the early root ᴱ√TARA(MA) “to batter, thud, beat” (QL/89). Other early “hammer” words include ᴱQ. petl “hammer” under the early root ᴱ√PETE (QL/73) and ᴱQ. tonga “a great hammer” under the early root ᴱ√TOŊO “to hammer” (QL/94).