There are a variety of words that can be used interchangeably with "baby cow." One such option is "calf," which is a popular term used for young cows before they reach puberty. Another synonym is "heifer calf," which refers specifically to female baby cows. Additionally, some people refer to young cows as "cowlets" or "calflets," which are less commonly used terms but still convey the same meaning. It is important to note that the term "baby cow" itself is often used more colloquially than scientifically and may not be the most accurate or specific way to refer to a young cow.