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: Plants that shed their leaves seasonally each year are called deciduous plants. 
Sentence2: vines shed their leaves seasonally each year.

A: each
****
Q: Sentence1: creating paper requires cutting down trees. 
Sentence2: Trees begin as epiphytes on host trees.

A: trees
****
Q: Sentence1: when a hemisphere is tilted towards the sun , that hemisphere receives more direct sunlight. 
Sentence2: when a hemisphere is tilted towards the sun , that hemisphere has more burned foliage.

A:
hemisphere
****