Croon and Trill
Trill verb - To sing with the alternation of two musical tones.
Usage example: a bluebird trilled outside our window
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Synonyms for Trill
Croon and trill are semantically related. You can use "Croon" instead the word "Trill" as a verb or a noun. popular alternative
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Google Ngram Viewer shows how "croon" and "trill" have occurred on timeline