Cow and Oxen

Cow noun - Female of domestic cattle: "`moo-cow' is a child's term".

Oxen and cow are semantically related In some cases you can use "Oxen" instead a noun "Cow".

Oxen noun - Domesticated bovine animals as a group regardless of sex or age.

Cow and oxen are semantically related in member of genus bos topic. You can use "Cow" instead a noun "Oxen".