The root √TIN was connected to Elvish words for twinkle and sparkle for much of Tolkien’s life. The root first appeared as ᴱ√TINI “twinkle” in the Qenya Lexicon of the 1910s with derivatives like ᴱQ. tintya- “sparkle” and ᴱQ. tinwe “star” (QL/92). The root also had derivatives in the contemporaneous Gnomish Lexicon such as G. tim “spark, gleam, (star)” and G. tintiltha- “twinkle” (GL/72). In The Etymologies of the 1930s he had the root ᴹ√TIN “sparkle, emit slender (silver pale) beams” with derivatives like ᴹQ. tin-/N. tinna- “glint” and ᴹQ. tinwe/N. tinw “spark, (small) star” (Ety/TIN). The root √TIN was mentioned regularly in his later writings with glosses like “spark” or “sparkle” (MR/388; PE17/22, 66).
Primitive elvish
spar
root. hunt, hunt, [ᴹ√] pursue
sparā-
verb. to hunt, pursue
tin
root. sparkle, spark, sparkle, spark, [ᴱ√] twinkle, [ᴹ√] emit slender (silver pale) beams
tini
noun. spark
elen
noun. star
ēl
noun. star
pharā-
verb. to hunt, pursue
The root ᴹ√SPAR “hunt, pursue” first appeared in The Etymologies of the 1930s with derivatives like N. faro “to hunt” and N. feredir “hunter” (Ety/SPAR). Tolkien first considered making this root ᴹ√PHAR⁽²⁾ (EtyAC/PHAR²). The root ᴹ√SPAR “hunt, pursue” reappeared in the Quenya Verbal System of the 1940s with the derived verb ᴹQ. fara- “hunt” (PE22/113). √SPAR “hunt” was mentioned a couple times in Tolkien’s later writings as well (PE17/83; PE18/94).