lúsinaadj. “glowing” (of things), “hearty” (of people) (QL:57). If this word is to be used in LotR-style Quenya, one would have to assume that it represents older *lúþina and is derived from a root *LUTH.
lussa- vb. "to whisper" (SLUS/SRUS). Since Tolkien eventually decided that roots in sl- yield Quenya words in hl- (though this was pronounced l- in late Exilic Quenya), it may be that the spelling *hlussa- is to be preferred.
lussënoun "a whispering sound" (SLUS/SRUS). Since Tolkien eventually decided that roots in sl- yield Quenya words in hl- (though this was pronounced l- in late Exilic Quenya), it may be that the spelling *hlussë is to be preferred.