Level is a palindrome that is a synonym for horizontal
Shahs is the palindrome for rulers of Iran or Iranian rulers.
A palindrome that is a synonym of "sudden noise" is "pop," as it reads the same forwards and backwards.
deed
wow
toot
pop
refer
That would be a pip.
dad.....palindrome means it makes no difference to a word when you read it forward or backwardor pop
Already answered elsewhere ~ deed
RADAR (RAdio Detection And Ranging)