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: Sponges are filter feeders. 
Sentence2: Hawksbills feed primarily on filter feeders.
answer:
feeders


question:
Sentence1: Refraction is the bending of light. 
Sentence2: a rainbow is formed by bending of light by separating light into all different colors.
answer:
bending


question:
Sentence1: Protease is the enzyme that digests proteins, amylase digests carbohydrates, and lipase digests fat. 
Sentence2: Mammalian teeth are important for a process using protease.
answer:

Protease