instruction:
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.
question:
Sentence1: After a seed is planted it is watered. 
Sentence2: seeds need water.
answer:
seed


question:
Sentence1: the mass of a planet causes the pull of gravity on that planet. 
Sentence2: the mass of a planet is what causes things to have weight.
answer:
mass


question:
Sentence1: a tape measure is used to measure length. 
Sentence2: Measure of length is by meter and land measure by hectares.
answer:

length