Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb coo

2 senses of coo

Sense 1
coo -- (speak softly or lovingly; "The mother who held her baby was cooing softly")
       => murmur -- (speak softly or indistinctly; "She murmured softly to the baby in her arms")

Sense 2
coo -- (cry softly, as of pigeons)
       => utter, emit, let out, let loose -- (express audibly; utter sounds (not necessarily words); "She let out a big heavy sigh"; "He uttered strange sounds that nobody could understand")