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: Most bryophytes are small. 
Sentence2: Most in the same group as mosses are small.

A: small
****
Q: Sentence1: Warm temperatures have helped plant growth and sizing. 
Sentence2: a greenhouse helps  plant growth.

A: growth
****
Q: Sentence1: Feathers help birds fly and provide insulation. 
Sentence2: All hawks are birds.

A:
birds
****