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.

[Q]: Sentence1: Some herbivores have more than one stomach. 
Sentence2: Camels are an herbivore.
[A]: herbivores


[Q]: Sentence1: Muscles can only contract. 
Sentence2: Contraction is a type of movement.
[A]: contract


[Q]: Sentence1: Infancy is the period of most rapid growth after birth. 
Sentence2: Infancy is the period of most rapid advancement.
[A]:
Infancy