The Swedish word for knife is
kniv

Translations for knife and their definitions

kniv	©
1. n-c. knife

skära	©
1. v. to cut; to perform an incision
2. v. to cut; to divide something with a knife, etc.
3. v. (with ner) to cut; to make reductions in a budget or the like
4. v. to cut oneself; to accidentally or intentionally hurt oneself with a sharp object
5. v. to curdle, said of milk, a sauce, etc.
6. v. (geometry) to cut; to intersect; to cross
7. n-c. sickle
8. adj. singular definite of skär
9. adj. plural of skär

hugga
1. v. to strike with something sharp (to cut into pieces, sculpt, damage, or for any other purpose); to stab, to cut, to hew, to chop, to fell (trees), to carve (sculpt)
Han högg honom i armen med kniven - He stabbed him in the arm with the knife
Han högg av honom armen med macheten - He chopped his arm off with the machete
Han högg ner ett träd - He cut down a tree
Han högg ved - He chopped wood
Han högg ut en krokodil ur stenen - He sculpted a crocodile out of the rock
Han högg med kniven i luften - He was stabbing with the knife in the air
2. v. to attack with a sharp body part, like teeth or claws, most commonly of biting
Vargen högg honom i benet - The wolf bit his leg
Vargen högg med käftarna i luften - The wolf was snapping its jaws (biting repeatedly) in the air
Örnen högg honom i armen med klorna - The eagle sank its talons into his arm
3. v. (by extension) to forcefully grab
Han högg tag i hans arm - He grabbed his arm
Han högg tag i geväret - He grabbed his rifle
4. v. (impersonal, often with till to express suddenness and short duration) to (suddenly) hurt
Det högg till i sidan - I felt a sting in my side