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: a pulley is used for lifting objects. 
Sentence2: Resistance exercises are weight-lifting exercises.

SOLUTION: lifting

PROBLEM: Sentence1: mineral graphite is used for making pencil lead. 
Sentence2: Diamond and graphite are made of carbon.

SOLUTION: graphite

PROBLEM: Sentence1: Plants that shed their leaves seasonally each year are called deciduous plants. 
Sentence2: Grapevines are woody deciduous plants.

SOLUTION:
Plants