Noldorin
gail
adjective. bright, light
gail
noun. bright light
gal-
prefix. light
geil
noun. star, bright spark
geil
noun. star
galad
noun. light
calad
gerund noun. light
calad
noun. light
el
noun. star
ephel
noun. outer fence, encircling fence
gildin
noun. silver spark
giliath
noun. all the host of stars
glaur
noun. golden light (of the golden tree Laurelin)
glor-
noun. golden light (of the golden tree Laurelin)
thora-
verb. to fence
A noun in The Etymologies of the 1930s glossed “silver spark”, a combination of the root ᴹ√GIL and ᴹ√TIN (Ety/TIN). Presumably this refers to stars, since both roots also have derivatives referring to stars.