What is the difference between a waning crescent and a eclipse?

Answer 1

A waning crecent is when the moon is just a sliver and is almost gone; an eclipse is when the sun covers the moon or the moon covers the sun depending on if it is solar or lunar eclipse

Answer 2

A waning crescent moon is a phase of the moon's cycle where less than half of the moon is illuminated and it appears as a crescent shape. An eclipse, on the other hand, is when one celestial body passes in front of another, blocking its light. Eclipse can refer to solar eclipses (when the Moon passes between the Sun and Earth) or lunar eclipses (when the Earth passes between the Sun and Moon).