Mushtarak is one word separately established for several distinct meanings. The source gives عَيْنٌ: it can mean an eye, the sun, a spring or gold.
Notice how surrounding words help:
• “The doctor examined the عَيْنٌ” points to an eye.
• “Water flowed from the عَيْنٌ” points to a spring.
The surrounding clue is called a Qarinah: a word or circumstance that helps identify the intended meaning. All meanings are not automatically intended together.