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: All monkeys are mammals. 
Sentence2: monkeys conserve body heat with their hair or fur.

A: monkeys
****
Q: Sentence1: Cultivation is easier if soil is loose. 
Sentence2: soil with more oxygen is easier to cultivate.

A: Cultivation
****
Q: Sentence1: Medical treatment is overseen by medical personnel. 
Sentence2: Hospital personnel may want to know your blood type.

A:
personnel
****