The Swedish word for butter is
smör

Translations for butter and their definitions

smör	©
1. n-n. butter (soft foodstuff made from milk)
2. n-n. (colloquial) flattering, sucking up

bre
1. v. (colloquial) apocopic form of breda tr=to spread
2. interj. (slang) bro (as a term of address)
Sho bre! - Sup bro!
3. interj. (slang) ng, Emphasizes a statement or question.
Det här spelet är fett svårt bre - This game is super difficult, I'm telling you

breda
1. adj. singular definite of bred
2. adj. plural of bred
3. v. to spread
Smittan breder ut sig - The infection is spreading
Hon brer sylt på mackan - She spreads jam on the sandwich
4. v. to butter (a sandwich)
Han brer mackan - He butters the sandwich
5. v. to make (a sandwich)
Hon gick till köket och bredde en macka - She went to the kitchen and made a (buttered) sandwich
6. v. (with på) to lay it on (thick)
7. v. (with på, often in the apocopic form "bre") to deliberately speak with a broad dialect