A noun in the Qenya Lexicon of the 1910s glossed “bird”, derived from the early root ᴱ√GWILI that was the basis for words having to do with flight (QL/104).
Middle Primitive Elvish
aiwē
root. (small) bird
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.
Qenya
aiwe
noun. (small) bird
oio
noun. bird
Early Quenya
aiwe
noun. bird
oi(we)
noun. bird
oive
noun. bird
wilin
noun. bird
Early Noldorin
aiw
noun. bird
Gnomish
aigli
noun. bird
bil
noun. bird
A word for “bird” in the Gnomish Lexicon of the 1910s appearing next to G. bilinc “sparrow”, but this word was deleted and the gloss for bilinc was expanded to “a small bird, especially sparrow” (GL/22-23). The form bil appeared in a couple other places in the Gnomish Lexicon (GL/23, 31), but seems to represent a “root” rather than a word. Tolkien indicated bil was derived from ᴱ✶du̯il (GL/31), but the exact mechanism whereby du̯- became b- isn’t clear, but a similar change is seen in 1920s ᴱ✶du̯ag- > ᴱT. baga- “beat” and ᴱ✶tu̯ak- > ᴱQ. pak- “apply, attach” (PE14/66).
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.
Quenya
aiwë
noun. (small) bird
A noun meaning “(small) bird” (SA/lin¹, Ety/AIWĒ), appearing in Radagast’s Quenya name Aiwendil “Lover of Birds” (UT/401). It was derived from primitive ᴹ✶aiwē like its Sindarin cognate aew (Ety/AIWĒ).
Conceptual Development: In the Gnomish Lexicon from the 1910s, ᴱQ. aiwe appeared as the cognate of G. aigli “bird” (GL/17), but in Early Noldorin notes from the 1920s, the cognate of ᴱN. aiw “bird” was given as ᴱQ. oive (PE13/136, 158) or oi(we) (PE13/132). A similar form oio (stem oiw-) appeared in notes on the Declension of Nouns from the early 1930s (PE21/12). In The Etymologies from the mid-1930s, the form ᴹQ. aiwe was restored (Ety/AIWĒ), and this is the source of the derivation given above.
aiwë
(small) bird
aiwë noun "(small) bird" (AIWĒ, SA:lin #1); Aiwendil "Lover of Birds" (UT:401)
aiwë
aiwe
wilin
bird
wilin noun "bird" (LT1:273; if this "Qenya" word is to be used in LotR-style Quenya, it must not be confused with the 1st pers. aorist of the verb wil-.)
Sindarin
aew
noun. (small) bird
A noun meaning “(small) bird” (SA/lin¹, Ety/AIWĒ), appearing in the name Linaewen “Lake of Birds” (S/119, UT/401). It was derived from primitive ᴹ✶aiwē like its Quenta cognate aiwë (Ety/AIWĒ), with the primitive diphthong ai becoming the ae in Sindarin.
Conceptual Development: In the Gnomish Lexicon from the 1910s, G. aigli “bird” was given as a derivative of the root ᴱ√aı̯, though in this early iteration Tolkien said it especially applied to larger instead of smaller birds (GL/17). In Early Noldorin notes from the 1920s, it became ᴱN. aiw “bird” (PE13/136, 158). In The Etymologies from the 1930s, the form became N. aew “(small) bird” (Ety/AIWĒ), and this is the source of the derivation given above.
aew
noun. (small) bird
aewen
adjective. of birds
aew
bird
(small bird) 1) aew. No distinct pl. form. 2) fileg, pl. filig; the form filigod appears as an alternative singular. or
aew
bird
. No distinct pl. form.
aewen
of birds
pl. aewin.
emlinn
yellowhammer
(= "yellow singer"); no distinct pl. form. Also emelin, no distinct pl. form; coll. pl. emelinnath. Adj.
fileg
bird
pl. filig; the form filigod appears as an alternative singular.
Noldorin
aew
noun. (small) bird
aew
noun. (small) bird
emelin
noun. yellow bird, "yellow hammer"
emlin
noun. yellow bird, "yellow hammer"
emmelin
noun. yellow bird, "yellow hammer"
fileg
noun. small bird
filigod
noun. small bird
A “root” (more likely just a primitive word) appearing in The Etymologies of the 1930s as the basis for the words ᴹQ. aiwe, N. aew “small bird” (Ety/AIWĒ). A precursor ᴱ√aı̯ to this root appeared in the Gnomish Lexicon of the 1910s with derivatives ᴱQ. aiwe, G. aigli “bird” (GL/17). The continued appearance of Q. aiwë (UT/401) and S. aew (S/119) in later writings strongly indicates this primitive form remained valid in Tolkien’s later writings.