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: Excretion is the process of removing wastes and excess water from the body. 
Sentence2: parasites remove waste from their bodies.
[A]: wastes


[Q]: Sentence1: an automobile engine transforms chemical energy into mechanical energy. 
Sentence2: cars transform chemical energy into mechanical energy.
[A]: chemical


[Q]: Sentence1: poisonous darts are used for defense by sea anemones. 
Sentence2: a toxin is used for defense by sea anemones.
[A]:
anemones