Reasoning

Dodge, duck, and avoid are all synonyms meaning evade. Flee means to run away from.

All except Cotton are synthetic fibres while cotton is a natural fibre.

Loaf, sourdough, and pumpernickel are types of bread. A rye is not a bread type. Loaf – Bread that is shaped and baked in one piece and usually sliced before being eaten. Pumpernickel – Dark, dense German bread made from coarsely ground whole-grain rye. Sourdough – Leaven for making bread, consisting of fermenting dough, typically that left over from a previous batch. Rye – A wheatlike cereal plant that tolerates poor soils and low temperatures.

All except Banana have seeds.

In all other pairs, second is the head of the first.

Heading, body, and closing are all parts of a letter; the letter is the whole, not a part.