sprat
spray
spree
sprig
One choice is spruce.
spruce
The analogy is "wouldn't is to couldn't as green is to scruple." In both cases, the first word is replacing a contraction of two words with a single word, and the second word starts with "scr," "spr," "str," or "thr."
The analogy of whirlwind is to breeze as downpour is to a word starting with scr spr str or thr 'sprinkle' or 'shower' is the answer.
sprainsprangspratsprawlsprayspreadspringsprinklesprintspritzersprocketsproutsprucespry
No, spread is not a compound word. If you separate spread you get spr/ead, and none of these are words.
The analogy of "mark is to marker" can be interpreted as "spread is to sprayer" where the action is performed by a tool associated with the given word starting with "spr."
spry
strange
The analogy of whirlwind is to breeze as downpour is to a word starting with scr spr str or thr 'sprinkle' or 'shower' is the answer.
Springer spaniel is a popular dog breed. Spring peeper is a frog species found in the eastern U.S.
spruce