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: Herbs are medicines and aids. 
Sentence2: herbs are used for curing people when they are sick.

A: Herbs
****
Q: Sentence1: Scyphozoans are the next group of Cnidarians, and they are the familiar jellyfish. 
Sentence2: Scyphozoans are aquatic organisms.

A: Scyphozoans
****
Q: Sentence1: Almost half the body heat lost in cold conditions escapes from the head. 
Sentence2: Head hair is especially important in cold conditions.

A:
cold
****