Вот цитата из HoME, том XII, part 1 "The prologue and apendices to the Lord od the Rings"
Цитата:
The orcs and goblins had languages of their own, as
hideous as all things that they made or used
А это из тома VIII, part 1 "The fall of Saruman"
Цитата:
Orcs piling up over the wall. Wild men
dimb on the goblins' dead bodies.
Это из FoTR - слва Гимли
Цитата:
`There are no goblins near, or my ears are made of wood. It is to be hoped that the Orcs will be content with driving us from Moria.
Ещё из FoTR
книга 2, глава 5
Цитата:
There are Orcs, very many of them,' he said. `And some are large and evil: black Uruks of Mordor. For the moment they are hanging back, but there is something else there.
А вот что говорится про этот момент в HoME, том VII
Цитата:
'There are goblins: very many of them,' he said. 'Evil they
look and large: black Orcs.(5) They are for the moment hanging
back, but there is something else there.
Оттуда же
Цитата:
Here, the trolls do not bring great slabs to
serve as gangways over the fiery fissure, but carry orcs across (it may
be noted incidentally that 'orcs', rather than 'goblins', becomes
pervasive in this text
А вот и пояснение 5
Цитата:
5. My father first wrote here: 'veritable Orcs'. Cf. the original sketch
for the chapter given in VI.443: 'Gandalf says there are goblins -
of very evil kind, larger than usual, real orcs', and my discussion
of 'goblins' and 'orcs' in VI.437 note 35. In FR at this point
Gandalf says: 'There are Orcs, very many of them. And some are
large and evil: black Uruks of Mordor.'
И наконец пояснения из тома VI
Цитата:
This is not the first use of the word Orcs in the LR papers: Gandalf
refers to 'orcs and goblins' among the servants of the Dark Lord,
pp. 211, 364; cf. also pp. 187, 320. But the rarity of the usage at this
stage is remarkable. The word Orc goes back to the Lost Tales, and
had been pervasive in all my father's subsequent writings. In the
Lost Tales the two terms were used as equivalents, though some-
times apparently distinguished (see II. 364, entry Coblins). A clue
may be found in a passage that occurs in both the earlier and the later
Quenta (I V.82, V.233): 'Goblins they may be called, but in ancient
days they mere strong and fell.' At this stage it seems that 'Orcs' are
to be regarded as a more formidable kind of 'Goblin', so in the
preliminary sketch for 'The Mines of Moria' (p. 443) Gandalf says
'there are goblins - of very evil kind, larger than usual, real orcs.' -
It is incidentally notable that in the first edition of The Hobbit the
word Orcs is used only once (at the end of Chapter VII 'Queer
Lodgings'), while in the published LR goblins is hardly ever used.
ИМХО, все это происходит и-за разницы во времени создания произведений.