die Kuppe
crest
The rounded summit of a hill or mountain.
Von der Kuppe des Hügels hatten wir eine fantastische Aussicht.
From the crest of the hill, we had a fantastic view.

crest / fingertip
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crest
The rounded summit of a hill or mountain.
Von der Kuppe des Hügels hatten wir eine fantastische Aussicht.
From the crest of the hill, we had a fantastic view.

You can always recognize the meaning of 'Kuppe' (crest / fingertip) from the context. If it is about geography, such as 'Berg' (mountain) or 'Hügel' (hill), it means the summit. If it is about the body, such as 'Finger' (finger) or 'Zeh' (toe), it means the soft tip.
Wir wanderten bis zur Kuppe des Berges.
We hiked up to the crest of the mountain.
When talking about the summit of a hill, the preposition is important. 'Auf der Kuppe' (on the crest, dative) describes a location, while 'auf die Kuppe' (onto the crest, accusative) indicates a direction.
Auf der Kuppe stand eine kleine Hütte.
There was a small hut on the crest.
In connection with fingers or toes, 'Kuppe' (tip) is often used in phrases that describe touching something or a small injury.
Er spürte den feinen Stoff mit seinen Fingerkuppen.
He felt the fine fabric with his fingertips.
tip / top / lace
'die Spitze' and 'die Kuppe' can both mean the upper part of a mountain or hill. 'die Spitze' emphasizes the highest point and can also suggest a rather pointed or clearly defined peak. 'die Kuppe', on the other hand, is rounded and gently shaped, especially with hills. Learners may confuse the words because both are located at the top of an elevation. If the shape is round, 'Kuppe' fits better. If you simply mean the highest point, 'Spitze' is more general.

Hinter der Kuppe des Hügels lag ein kleines Dorf.
Behind the crest of the hill lay a small village.
Am Nachmittag standen wir endlich auf der Spitze des Berges.
In the afternoon, we finally stood on the peak of the mountain.