Croon

hyräily

(soft, low-pitched sound; soft or sentimental hum, song, or tune)

kumina

(low-pitched sound of a large bell)

hymistellä

((transitive, intransitive) to speak (words) softly in a low pitch or in a sentimental manner — see also coo)

hymistä

((transitive, intransitive) to speak (words) softly in a low pitch or in a sentimental manner — see also coo)

hyräillä

((transitive, intransitive) to hum or sing (a song or tune) softly in a low pitch or in a sentimental manner; to sing (a popular song) in a low, mellow voice)

hyräillä

(to soothe (a person or an animal) by singing softly)

kumista

(of a large bell: to make a low-pitched sound)

ynistä

(to make a continuous hollow low-pitched moan, as of cattle — see also bellow, low)