night·time 
/ˈnaɪtˌtaɪm/ noun
/ˈnaɪtˌtaɪm/ noun [noncount] : the time of darkness between one day and the next : the time of day when no light from the sun can be seen
▪ It's not safe to go out at nighttime. [=(more commonly) night] ▪ The animal hunts in the nighttime. — often used before another noun ▪ nighttime temperatures ▪ a nighttime attack
▪ It's not safe to go out at nighttime. [=(more commonly) night] ▪ The animal hunts in the nighttime. — often used before another noun ▪ nighttime temperatures ▪ a nighttime attack
