Except 'Dilution' all other signifies division. While Dilution is a liquid that has been diluted with liquid.

All others are antonyms.

In all others, first is required by the second for its functioning.

Only this is not an instrument for action pair.

Frog don't bleat, they always crock.

In all other pairs, second in the source of food for the first one.

Except `Long- High ' , all options having opposite word.

In all other pairs, second denote a characteristics of the first

Except 'Dust - Vaccum cleaner' , all second things in the option come in use with help of first.

In all other pairs, second is a part of the first.