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: an image in a mirror is formed by reflecting light. 
Sentence2: mirrors can be seen with our eyes.
[A]: mirror


[Q]: Sentence1: Fully cooking oysters kills the bacteria. 
Sentence2: Fully cooking oysters can prevent illness.
[A]: Fully


[Q]: Sentence1: Many seeds can wait to germinate until conditions are favorable for growth. 
Sentence2: Seeds wait to germinate until factors favor growth.
[A]:
germinate