IPA: //ˈkreɪdəlˌsɔŋ//
KK: /ˈkreɪdəlˌsɔŋ/
A gentle song sung to help a child sleep.
She sang a sweet cradlesong to her baby at bedtime.
Cradlesong is formed from "cradle" (from Old English *cradol*, meaning a bed or a place for a baby) and "song" (from Old English *sang*, meaning a musical composition). The word refers to a soothing song sung to a baby in a cradle.
Imagine a gentle 'bed' ('cradle') where a baby lies, and think of a 'musical composition' ('song') sung to lull them to sleep.
No commonly confused words.