(i ngost = i ñost, o n’gost = o ñgost) (terror), pl. gyst (in gyst = i ñgyst).
Sindarin
goss
dread
gost
dread
achas
dread
(fear), pl. echais. It is possible that the word is lenited in the source, and that it should have an initial g-; if so read gachas (i ’achas), pl. gechais (i ngechais = i ñechais), coll. pl. achassath.
daedhelos
great dread
(i naedhelos, o ndaedhelos), pl. daedhelys (i ndaedhelys). Coll. pl. daedhelossath. A side-form ends in -oth instead of -os. The word appears in the mutated form "ndaedelos" in LotR Appendix F, but since the second element must be delos "abhorrence" and it would surely be lenited following a vowel, this would seem to be one of the cases where Tolkien wrote d even though dh would be technically correct.
delos
dread
(i dhelos) (fear, horror, abhorrence, detestation, loathing), pl. delys (i nelys), coll. pl. delossath. A side-form ends in -oth (pl. -yth) instead of -os (-ys).
gae
dread
(i ’ae), no distinct pl. form except with article (i ngae = i ñae)
goroth
dread
(i ngoroth = i ñoroth, o n’goroth = o ñgoroth) (horror), pl. geryg (in geryg = i ñgeryg) (WJ:415). Archaic pl. ✱göryth.
gorth
dread
(i ngorth = i ñorth, o n’gorth = o ñgorth) (horror), pl. gyrth (in gyrth = i ñgyrth). (WJ:415) Note: a homophone means ”dead; dead person”.
guruthos
dread of death
(i nguruthos = i ñuruthos, o n’guruthos = o ñguruthos) (death-horror), pl. (if there is a pl.) either guruthys (in guruthys = i ñguruthys) or gyrythys (in gyrythys = i ñgyrythys) with umlaut throughtout the word. Coll. pl. guruthossath.
gôr
dread
(i ngôr = i ñôr, o n’gôr = o ñgôr, construct gor) (fear, horror), pl. gŷr (in gŷr = i ñgŷr). Note: a homophone means ”vigour”, but has different mutations.
(i ’oss, constuct gos) (horror), pl. gyss (i ngyss = i ñyss).