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.

Sentence1: hunting requires seeing prey. 
Sentence2: hunting requires seeing an animal.
hunting

Sentence1: Sweat glands produce more sweat. 
Sentence2: When the body is hot, something coming from a gland is produced to cool the body.
glands

Sentence1: electrical current running through a wire causes that wire to heat up. 
Sentence2: kinetic energy  running through a wire causes that wire to heat up.

causes