Houyhnhnm language

(?) - approximate, guessed

Yahoo - a barbaric humanoid; evil; having worse or poor quality; human (?) : Part 4, Chapter 1 (4,1)
Houyhnhnm - horse; perfection of nature; a sentient horse from an island south of the Australian coast : 4,1
Hhuun - attend [to him] : 4,1
Hnea-Yahoo - the Yahoo's evil; a disease (?) : 4,7
Ylnhiamshy - aborigines, natives : 4,8
Ihnuwnh - to return to a first mother; to die : 4,8
Hhnm Yahoo - the folly of a servant : 4,9
Whnaholm Yahoo - the loss of a child : 4,9
Ynlhmndwihlma Yahoo - a stone that cuts their feet (?) ; continued bad weather (?) : 4,9
Ynholmhnmrohlnw Yahoo - a poorly-built house : 4,9
Nnuhnoh - a small mammal that is as large as a rabbit that is hunted for its fur : 4,10
Hnuy illa nyha majah Yahoo - take care of thyself, gentle Yahoo : 4,11

The Houyhnhnm language is based on the neighing of horses.

Laputan language, and Barlnibarbian and Luggnaggian as well

Laputan:

Lap (archaic) - high
untuh (archaic) - governor
Lapuntuh (archaic) - high governor, modernized as "Laputa"; the name of the flying island
Lagado - capital city
Flandona Gagnole - Astronomer's Cave
Balnibarbi - a continent located under Laputa
Munodi - a governor in Laputa
"Tribnia" (invented) - Gulliver's anagram for "Britain", a nation of informers
"Langden" (invented) - Gulliver's anagram for "England"

Balnibarbian:

Ickpling gloffthrobb squut serumm blhiop mlashnalt zwin tnodbalkuffh slhiophad gurdlubh asht - May your celestial majesty outlive the sun eleven moons and a half
Fluft drin yalerick dwuldom prastrad mirpush - My tongue is in the mouth of my friend; I need to bring my interpreter
bliffmarklub - high chamberlain

Luggnaggian:

Luggnagg - an island east of Japan
Maldonada - a large port in Luggnagg
Glubbdubdribb - an island of sorcerers and magicians
Clumegnig - a river that flows along the southeastern point of Luggnagg
Traldragdubb, Trildrogdrib - a port in Luggnagg
struldbrug -an immortal with a red mark on his forehead who becomes incapable on activity upon reaching old age
slumskudask - an item given by a struldbrug to ensure that the receiver remembers him
Glanguenstald - a port in southwestern Luggnagg, that functions as its only link with Japan

Brobdingnagian language

(?) approximate, guessed

Brobdingnag - (name of a country) : not mentioned
Grildrig - a tiny man : Part 2, Chapter 2 (2,2)
Glumdalclitch - a little nurse : 2,2
splacnuck - a six-foot long animal : 2,2
grulrud - town crier : 2,2
Lorbrulgrud - Pride of the Universe : 2,2
Slardral - gentleman usher : 2,3
relplum scalcath - freak of nature, unrestrained person
glomglung - a unit of measurement; three glomglungs correspond to 54 English miles (86.9 kilometres) : 2,4
Flanflasnic - a city "within eighteen English miles of the seaside" (28.97 kilometres) : 2,8

Lilliputian language: terms, phrases, names, and words and their approximate translations

(?) - approximate, guessed

Lilliput - (name of a country, enemy of Blefescu) : Part 1, Chapter 1 (1,1)
Tolgo phonac - Fire the arrows (?) : 1,1
Hekinah degul - Amazing (?) : 1,1
Langro dehul san - Tie him up (?) : 1,1
Borach mevolah - Keep away! (?) : 1,1
Hurgo -  Great Lord : 1,1
Peplom selan - tend to him (?) : 1,1
Lumos kelmin pesso desmar lon Emposo - [You are to] swear peace between yourself and the Emperor of Lilliput, and towards his Empire : 1,2 ; 1,7
Imprimis - Greetings / Salutations : 1,2
Quinbus Blestrin, Quinbus Flestrin - Great Man-Mountain : 1,2
Ranfulo - breeches : 1,2
Clefrin Frelock - (name of an official) : 1,2
Marsi Frelock - (name of an official) : 1,2
Flimnap - (name of a treasurer) : 1,3
Reldresal - (name of a principal secretary for private affairs) : 1,3
Skyresh Bolgolam - (high admiral) : 1,3
Galbet - admiral of the realm : 1,3
Golbasto Momaren Evlame Gurdilo Shefin Mully Ully Gue - (name of the contemporary Emperor of Lilliput) : 1,3
blustrug - (a unit of length; 5,000 blustrugs, the size of Lilliput, is 12 miles in circumference, corresponding to 19 kilometres) : 1,3
Belfaborac - (a royal palace in Lilliput) : 1,3
Mildendo - (the capital of Lilliput) : 1:4
drurr - (1/14 of an inch, or around 1.8 millimetres) : 1,4
Tramecksan - high heels : 1,4
Blefuscu - (name of a county, enemy of Lilliput) : 1,4
Lustrog - (name of a prophet) : 1,4
Blundecral - (sacred book of the Lustrogist Lilliputians) : 1,4
glumgluff - (6 feet, or 1.8 metres) : 1,5
nardac - (a high rank in the Lilliputian Empire's government) : 1,5
glumglum - (a rank lower than a nardac) : 1,6
Limtoc - (name of a general) : 1,7
Lalcon - (name of a chamberlain) : 1,7
Balmuff - (name of a grand judiciary official) : 1,7

Lilliputian appears to be influenced by Jonathan Swift's native English, Latin, and possibly Hebrew (as in "Tolgo phonac", "Hekinah degul", and "Borach mevolah").