As no other word beginning in ph- is attested, it is assumed that a nasal mutation is triggered by the pronoun în.1 , hence the form observed in the "King's Letter"
Sindarin
gor-
prefix. owing to approach of GUR to other stems Sindarin tended to use gor- in a very strong sense of things very painful and horrible to do
gor-
prefix. hard, difficult
gor-
verb. to warn, urge
gurgof
noun. traitor
dîr
adjective. hard, difficult
gurgof
noun. traitor
pân
adjective. all, in totality
pân
adjective. all, all, *complete, entire, full, the whole
@@@ extended meaning suggested on Discord 2022-03-11
Gorgoroth
deadly fear
gorgoroth (i ngorgoroth = i ñorgoroth, o n**gorgoroth = o ngorgoroth) (terror), pl. gergeryth (in gergeryth = i ñgergeryth). Archaic pl. görgöryth. Also in shorter form gorgor (i ngorgor = i ñorgor, o n**gorgor = o ñgorgor) (extreme horror), pl. gergyr (in gergyr = i ñgergyr), coll. pl. gorgorath (WJ:415). Archaic pl. *görgyr. (verb), see FEEL TERROR.
gorgor
deadly fear
gorgor (i ngorgor = i ñorgor, o n**gorgor = o ñgorgor) (extreme horror), pl. gergyr (in gergyr = i ñgergyr), coll. pl. gorgorath (WJ:415). Archaic pl. görgyr. Also in longer form gorgoroth (i ngorgoroth = i ñorgoroth, o n**gorgoroth = o ñgorgoroth) (terror), pl. gergeryth (in gergeryth = i ñgergeryth). Archaic pl. *görgöryth.
pân
all
(adj.) *pân, pl. pain (only attested in mutated pl. form phain, SD:128-31). Not to be confused with the noun pân ”plank”.
pân
all
pl. pain (only attested in mutated pl. form phain, SD:128-31). Not to be confused with the noun pân ”plank”.
_ pref. _owing to approach of GUR to other stems (as ÑGUR 'death', ÑGOR 'terror, dread') Sindarin tended to use gor- in a very strong sense of things very painful and horrible to do. It used dír- 'tough' for lesser efforts. Q. uru-. >> dirbedui, gorbedui, gornod