TASK DEFINITION: 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.
PROBLEM: Sentence1: Plants that shed their leaves seasonally each year are called deciduous plants. 
Sentence2: vines shed their leaves seasonally each year.

SOLUTION: each

PROBLEM: Sentence1: a flower 's purpose is to produce seeds. 
Sentence2: Every job has meaning and purpose.

SOLUTION: purpose

PROBLEM: Sentence1: Secondary growth forms secondary vascular tissues and bark. 
Sentence2: Secondary growth produces secondary vascular tissues in seed plants.

SOLUTION:
secondary