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: Endocrine glands include the pituitary, thyroid, parathyroid, adrenal, pineal and thymus glands. 
Sentence2: Some pituitary hormones can control the thyroid gland.

A: thyroid
****
Q: Sentence1: Heterotrophs are living things that cannot make their own food. 
Sentence2: food contains organic molecules.

A: food
****
Q: Sentence1: completing a circuit causes electricity to flow through that circuit. 
Sentence2: current follows a circuit.

A:
circuit
****