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.
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Question: Sentence1: Chordates have a complete digestive system and a closed circulatory system. 
Sentence2: All chordates are vertebrates.

Answer: Chordates


Question: Sentence1: Insects have 2 antennae. 
Sentence2: Insects have 2 appendages to detect sound.

Answer: 2


Question: Sentence1: An object is an item in the real world. 
Sentence2: if an item is black then that item absorbs all visible light.

Answer:
item