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.
ama
noun. mother
amba
adverb. up
áma
noun. mind, heart, thought
amaimi
noun. mother
ambi
noun. mother
(m)ambe
noun. mother
am(u)-
prefix. up(wards)
am-
prefix. up(wards)
ambe
noun. mother
amis
noun. mother
ammi
noun. mother
amu
adverb. up(wards)
âmi
noun. mother
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.