Double and Knife edge

Double noun - Something or someone that strongly resembles another.

Knife edge and double are semantically related In some cases you can replace phrase "Knife edge" with "Double", this terms are similar.

Nearby Words: doubled, doublet, doubling, doubly

Knife edge noun - The sharp cutting side of the blade of a knife.

Double and knife edge are semantically related in fold topic. Sometimes you can use "Double" instead a noun phrase "Knife edge".