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: Germination depends on the seed coat. 
Sentence2: the force of water causes germination with the emergence of a root.
[A]: Germination


[Q]: Sentence1: Mammals depend on the vegetation for food and shelter. 
Sentence2: Mammals are Heterotrophs.
[A]: Mammals


[Q]: Sentence1: a compass is used to navigate oceans. 
Sentence2: On moonless nights they navigate solely with the geomagnetic compass.
[A]:
compass