I can do
stimulate : excite
Reproach : praise completes the analogy.
the people in the boat had to keep still or the boat would capsize
Urge
Help
Drawback
guard : sentinel
soothe
The answer to the analogy "taboo is to forbidden as cheerful is to" would be happy. Taboo and forbidden are synonymous in meaning, so cheerful and happy would be the appropriate pair in this analogy.
Snarl grow
entreaty : plea
toughen : strengthen