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: Dromaeosaurs are part of the theropod group of dinosaurs. 
Sentence2: Birds evolved from a group of bipedal dinosaurs that included Dromaeosaurs.

Answer: Dromaeosaurs


Question: Sentence1: hunting requires seeing prey. 
Sentence2: hunting requires seeing an animal.

Answer: hunting


Question: Sentence1: While a baby is very young, during infancy, co-sleeping is very convenient for feeding schedules. 
Sentence2: Very young babies have the period of most rapid growth after birth.

Answer:
baby