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: Plants exhibit phototropism, or growing toward a light source. 
Sentence2: Bamboos are vigorous, rugged plants.
[A]: Plants


[Q]: Sentence1: Most bryophytes are small. 
Sentence2: Most in the same group as mosses are small.
[A]: small


[Q]: Sentence1: Mechanical weathering produces detritus. 
Sentence2: A glacier can produce detritus.
[A]:
detritus