Analogy: brother: mother :: fly : ?? (4 letters)

Question

flower: rose :: tree: ??? (6 letters)

they have to start with scr, str, spr, or thr.

Answer 1

http://www.teachervision.fen.com/vocabulary/reading-comprehension/6697.html

Answer 2

flower: rose :: tree : spruce

Answer 3

That's good!!

Answer 4

brother : mother :: fly : spry

Spry means lively, brisk, or vigorous.

Answer 5

I am having homework on that now