keys

In a sentence

• Jag har tappat bort mina nycklar.

  I have lost my keys.

  Here, the word 'nycklar' refers to physical objects used to open locks.

• Musikern spelade en melodi på sina tangenter.

  The musician played a melody on his keys.

  In this case, 'tangenter' refers to the keys of a musical instrument, such as a piano.

• Forskaren fann nyckeln till problemet.

  The researcher found the key to the problem.

  Here, 'nyckeln' is used metaphorically to mean the solution or main idea related to something.