The Dutch term "oer-" matches the English term "greatgrand"

other dutch words that include "oer" : english :
aanvoer supply, arrival, arrivals
aanvoerder boss, chief, leader, commander
aanvoeren govern, command, order
afvoerder abductor
afvoeren eliminate
beloeren spy
beroerd bad
beroering commotion
bidsnoer rosary
boer peasant, farmer, page
boer countryman, rancher
Boer Afrikaner
Boer Afrikander, Boer
boerderij estate, ranch, property
boeren belch, burp
Boeroendi Burundi
Boeroendisch Burundian
boers rural
boerten jest
breedvoerig wide, vast, spacious
broer brother, sibling
doorroeren whirl, whip, froth
doorvoeren apply, achieve, practice
een gesprek voeren converse
floers fog, mist
geestvervoering ecstasy
halssnoer necklace
hengelsnoer line
hoer whore, hooker
hoera hurray
hoera roepen cheer
hoerenkast brothel
hoeri houri
invoer input
invoeren import
jaloers jealous, envious
jaloers zijn op envy
kangoeroe kangaroo
Koerd Kurd
Koerdisch Kurdish
Koerdistan Kurdistan
koers direction, course
Mantsjoerije Manchuria
Mantsjoerijns Manchurian
moer marsh, swamp, nut
moeras swamp, marsh
moerbei mulberry-tree
moerbeiboom mulberry-tree
moersleutel spanner
Oeral Ural
oeros aurochs
oerwoud jungle
omroeren whirl, froth, whip
ontroeren move, stir
ontroerend moving
ontvoeren abduct
ontvoering abduction
Oostermoersevaart Hunze, Oostermoersevaart
oproerig insubordinate, rebellious
oproerling rebel, mutineer
ploert crook, rogue, scoundrel
Poerimfeest Purim
redevoering speech
richtsnoer guide-book
roer handlebars, helm, rudder, gun, rifle
Roer Ruhr
roeren froth, whirl, whip
roerend touching, mobile, moving
roerigheid riot, tumult
roerloos motionless
rumoer noise, ado, din
rumoerig noisy
samoerai samurai
snoer rope, necklace, line
strijd voeren fight
taboeret stool
tamboer drummer
toer voyage, outing, trip, journey, excursion
toereiken suffice
toereikend zijn suffice
toerisme tourism
toerist tourist
toernooi tournament
toerusten equip
uitvoeren introduce, equip, export, play
uitvoering version
vervoering ecstasy
vloerkleed carpet
vloerzeil linoleum
voeren wear, transport, carry
voering lining
voertuig vehicle
Dutch as an Influencer
The English language has much to thank Dutch for. Dutch settlers came to the American colonies during the 17th century and added a few words to the vocabulary. Words like Santa Claus, waffle, blink, cookie, bazooka, gin, and iceberg wouldn’t exist without it.
Learning Dutch is Easier for English Speakers
Given the influence Dutch has had on English, it makes sense that Dutch is easier for speakers to learn. This is in part because Dutch, German, and English have similar roots. It’s between English and German. It only has two definite articles, “de” and “het” to English’s one “the” and German’s “der”, “die”, “das”. But Dutch words are more difficult to pronounce. The way words are pronounced indicates to a native speaker whether they’re talking to a second-language speaker.
Dutch is a Melting Pot of Languages
Just as English owes a lot to Dutch for contributing to its vocabulary, Dutch owes the same to other languages. It picked up words like jus d’orange (orange juice) and pantalon from French, mazzel (lucky) and tof (cool) from Hebrew and others. Dutch also incorporates texting and social media slang from English as well as street slang from places like Morocco, the Antilles, and Suriname.