The English term "x-mas" matches the Swedish term "jul"

other english words that include "mas" : swedish :
abomasum löpmage
admass lättpåverkad masspublik
amass hopa
armastice vapenstillestånd
bandmaster kapellmästare
biomass fuel biobränsle
Christmas jul
Christmas-tree julgran
Christmas Day juldagen
Christmas Eve julafton
Christmas present julklapp
commas kommatecken
damascus damaskus
damask damast
day after Christmas Day annandag (jul)
dimast avmasta
drawing-master teckningslärare
emasculate förvekliga, kastrera
Father Christmas jultomte
foremast fockmast
Freemason frimurare
gamemaster gymnastiklärare
gas mask gasmask
headmaster rektor
jemimas resårkängor
masculine maskulin
mash mosa, mos
mashed-potatoes potatismos
mask maskera, mask
mason murare, frimurare
masoretes masoreterna
masque maskspel
masquerade maskerad
masquerades maskeras
mass massa, mässa
mass-produce massproducera
mass media massmedia
massacre massakrera, massaker
massage massage
masseur massör
massif bergmassiv
massive massiv
mast mast
master behärska, bemästra, mästare, patron, husbonde
master-stroke genidrag
master copy matris, original
Master of Arts filosofie magister
Master of Science filosofie magister
master one's temper behärska sig
master`s desk kateder
mastered kännare
masterful dominerande
masterkey huvudnyckel
masterly mästerlig
masterpiece mästerverk
mastery sakkunskap, herravälde
masthead masttopp
masticate tugga
mastiff stor hund
mastodon mastodont
masturbate onanera
masturbating onanerande, onani
michaelmas mickelsmässa
pajamas pyjamas
quartermaster intendent, styrman
schoolmaster läroverkslärare, magister
senior assistant master lektor
smash kras, krossa, krock, slå sönder
tast-master ceremonimästare
unmask demaskera
whoremaster horkarl
An Understandable Neighbor
Anyone who speaks Swedish or travels there quickly finds out that Swedish, Danish, and Norwegian languages are mutually understood between speakers. So learning Swedish is beneficial for anyone who has a goal of being multi-lingual.
Say Thank You
There is no real word for please in Swedish. The closest word is “Tack” which means “Thank you” but the word please doesn’t translate into Swedish. Saying “tack” in a respectful tone is the best way to solve this dilemma. Swedish also has a smaller vocabulary compared to other languages in part because of its concentrated population of speakers.
Articles After Nouns
One of the most difficult things to learn in a new language is figuring out which article goes with the noun. In Swedish the article comes after the noun. So “the dog” becomes “hund” and “en” or “hunden” making the process a little easier to remember.