Duck is a very lame, boring, easy, or
useless thing. It's mostly used as an insult, or to say a person isn't very cool or nice.
Hero is an interesting, yet difficult thing. It's used to say something or someone is really cool, nice, or poular
Duck to
Hero is a term used as a scale measurement. It would be used to compare things.
"On a scale of Duck to
Hero, how hard do you think the test was?"
"That swim practice was really
Hero, we had to swim a 200 butterfly."
"She's such a Duck! She didn't know what -9+-7 was!"
OMG! Suzy is such a
Hero! She is like, the coolest girl in the grade!"