Cases of word usage

1) a sharp cutting part of a knife (blade)

2) an act, result, of cutting; opening made by a knife or other sharp-edged tool etc (cut)

3) of knife (knives)

4) a pointed, two-edged knife as used by surgeons (lancet)

5) a wide, heavy knife used in Latin America as a tool and weapon (machete)

6) small knife with one or more folding blades (penknife)

7) a long container for the blade of a sword, knife etc (scabbard)

8) a small, light knife as used by surgeons (scalpel)

9) a cover for the blade of a knife etc; condom (sheath)

10) to put (a knife etc) into a sheath (sheathe)