Generate an overlapping word between the given two sentences. When you find the overlapping words, they don't have to match exactly, e.g., "survival" and "survive" are valid overlapping words. Little words like "the" or "of" don't count! You must generate significant words which are not the stop words.

[Q]: Sentence1: Some herbivores have more than one stomach. 
Sentence2: Camels are an herbivore.
[A]: herbivores


[Q]: Sentence1: Landslides Seismic vibration is a common triggering mechanism for landslides. 
Sentence2: Erosion can cause seismic vibrations which are triggering mechanisms.
[A]: Seismic


[Q]: Sentence1: Sunlight is composed of photons, or particles of solar energy. 
Sentence2: a plant requires  photons for photosynthesis.
[A]:
photons