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.
nildo
noun. friend [m.]
nilmo
noun. friend
nil
noun. blue-bell, harebell
-dildo
suffix. -friend
-nildo
suffix. -friend
-(n)dil
suffix. -friend
-dil
suffix. -friend
-el
suffix. friend
-iel
suffix. -friend
-nil
suffix. -friend
-ser
suffix. friend
helde
noun. friend
heldo
noun. friend
helmo
noun. friend
málo
noun. friend
sermo
noun. friend
seron
noun. friend
sondo
noun. friend
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 word in the Declension of Nouns of the early 1930s translated as “harebell” (PE21/19) or “blue-bell” (PE21/26), which are different English names for the same kind of flower.
Conceptual Development: In the Qenya Lexicon and Poetic and Mythological Words of Eldarissa of the 1910s, ᴱQ. qille (qilli-) was “bluebell” based on the early root ᴱ√QILI having to do with colours (QL/77; PME/77). These documents also had a more elaborate form ᴱQ. {qillenen >>} qillinin (qillinind-) for “bluebell”, where the second element was probably ᴱQ. nin (nind-) “blue” (QL/66).