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.

Sentence1: Similarly, stars are referred to as suns, but our star is the Sun. 
Sentence2: our star causes water to evaporate more quickly by adding heat.
our

Sentence1: Germination depends on the seed coat. 
Sentence2: the force of water causes germination with the emergence of a root.
Germination

Sentence1: Oxygen is just one substance transported by the blood. 
Sentence2: Blood glucose is the substance that feeds our cells.

blood