Level 4: ‘Anything’ is longer than ‘String’

4.

Shorter than string,
and the same length as tall.
I sound like a duck,
and you need me now most of all.

 

Whoa. The Appearance of the 1st Red Herring.

Red Herring: Picture, Browser Title, I guess

Hint:

“short”, “tall”, and all things related to length are shorter or taller in letter’s case.
“I sound like a duck, and you need me now most of all.”

Answer:

luck

Literally!

Shorter than string, (Yep. “luck” shorter than “string”)
and the same length as tall. (Both 4 letters long)
I sound like a duck, (Rhymes with duck)
and you need me now most of all. (How true)