wund
sore
Describes an area of skin that is irritated, red, and painful due to friction, pressure, or an injury.
Nach der langen Wanderung hatte ich wunde Füße.
After the long hike, I had sore feet.

sore
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sore
Describes an area of skin that is irritated, red, and painful due to friction, pressure, or an injury.
Nach der langen Wanderung hatte ich wunde Füße.
After the long hike, I had sore feet.

The adjective 'wund' (sore) is closely related to the noun 'die Wunde' (wound). Both words refer to an injury or a painful spot on the body.
Durch die Reibung des Schuhs ist meine Ferse jetzt ganz wund.
Because of the friction from the shoe, my heel is now really sore.
In its literal meaning, 'wund' (sore) is almost always combined with body parts or the skin. Typical examples are 'wunde Füße' (sore feet), 'eine wunde Nase' (a sore nose), or 'wunde Stellen auf der Haut' (sore spots on the skin).
Vom vielen Niesen hatte er eine ganz wunde Nase.
From sneezing so much, he had a really sore nose.
The construction 'sich wund + Verb' expresses an excessive action. It follows the pattern: subject + verb + sich (accusative) + body part (accusative) + wund.
Sie hat sich die Finger wund getippt, um den Bericht fertigzustellen.
She typed her fingers sore to finish the report.
The idiom 'ein wunder Punkt' (a sore point) is a fixed combination and means a sensitive, emotional topic. The word 'wund' (sore) is used here only in this combination.
Die finanzielle Situation der Firma ist momentan ein wunder Punkt.
The company's financial situation is currently a sore point.
healthy
'gesund' and 'wund' form an opposite when it comes to the condition of the body or skin. 'gesund' describes a person in general: they are not ill and feel well. 'wund' usually describes a specific area of skin that is painful, red, or irritated. So you are more likely to say 'eine wunde Stelle' (a sore spot) or 'wunde Füße' (sore feet), not simply 'eine wunde Person' (a sore person). 'gesund' is general; 'wund' is more specific for a painful area on the body.

Nach der langen Wanderung waren ihre Füße wund.
After the long hike, her feet were sore.
Nach der Operation möchte die Familie wissen, wann er wieder gesund ist.
After the operation, the family wants to know when he will be healthy again.