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.

[EX Q]: Sentence1: hiding can be used for avoiding predators. 
Sentence2: Camouflage is used for avoiding predators.
[EX A]: avoiding

[EX Q]: Sentence1: Plants use unsaturated fatty acids to store energy. 
Sentence2: Plants and fish contain fatty acids.
[EX A]: Plants

[EX Q]: Sentence1: Steroid hormones are the longest acting hormones. 
Sentence2: steroids are chemical messengers that control many body functions.
[EX A]:
Steroid