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: a flower 's purpose is to produce seeds. 
Sentence2: Every job has meaning and purpose.
purpose

Sentence1: Parasites are organisms that live off a host. 
Sentence2: roundworms may be free-living or live off a host.
host

Sentence1: Antibiotics Chlamydial infections are treated with an antibiotic. 
Sentence2: Chlamydia is not caused by a virus.

Chlamydial