COO

coo. Coo, v.i. to cry like a dove or pigeon

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Coo (?), v. i. [imp. & p. p. Cooed (?); p. pr. & vb. n. Cooing.] 1. 1. To make a low repeated cry or sound, like the characteristic note of pigeons or doves.
The stockdove only through the forest cooes, Mournfully hoarse. Thomson. 2. 2. To show affection; to act in a loving way. See under Bill, v. i. “Billing or cooing.” Byron.