Blue fox and White fox

Blue fox noun - A variety of Arctic fox having a pale grey winter coat.

White fox and blue fox are semantically related in arctic fox topic. In some cases you can use "White fox" instead a noun phrase "Blue fox", when it comes to topics like polar fox.

White fox noun - Thickly-furred fox of Arctic regions; brownish in summer and white in winter.

Blue fox and white fox are semantically related in arctic fox topic. You can use "Blue fox" instead a noun phrase "White fox", if it concerns topics such as polar fox.