The Swedish word for button is
knapp

Translations for button and their definitions

knapp	©
1. adj. scarce, not much of something
tiden är knapp
there's not much time
växa upp under knappa omständigheter
to grow up under conditions where nothing is abundant
2. adj. somewhat less than
en knapp kilometer
somewhat less than one kilometre
3. n-c. button
4. n-c. knob, lever, switch (e.g. the button for an electrical on/off switch)
5. n-c. (botany) anther

pin
1. adj. (colloquial) embarrassing
Så jäkla pin asså! - So f--ing embarrassing!
2. n. (mostly in (reference to) the phrase below) pain, torment
3. adv. (colloquial) very, really, super-
4. n-n. Alternative form of pins

knopp
1. n-c. (botany) a bud (of a flower)
2. n-c. a knob, a bulb, a ball, a stud, a rounded tip or top; compare knapp, ratt, handtag
3. n-c. (slang) head (on a person; used in many expressions)
klar i knoppen
clear thinking, awake