honeydew melon vs winter melon

honeydew melon and winter melon both are nouns.

Word	Noun	Adjective	Verb	Adverb
honeydew melon	Yes	No	No	No
winter melon	Yes	No	No	No

As nouns, winter melon is a hypernym of honeydew melon; that is, winter melon is a word with a broader meaning than honeydew melon:

honeydew melon: the fruit of a variety of winter melon vine; a large smooth greenish-white melon with pale green flesh
winter melon: the fruit of the winter melon vine; a green melon with pale green to orange flesh that keeps well

As nouns, honeydew melon and winter melon are synonyms defined as:

honeydew melon and winter melon: any of a variety of muskmelon vines having fruit with a smooth white rind and white or greenish flesh that does not have a musky smell

Other synonyms of honeydew melon include Cucumis melo inodorus, Persian melon, winter melon vine.

honeydew melon (noun)	winter melon (noun)
the fruit of a variety of winter melon vine; a large smooth greenish-white melon with pale green flesh	the fruit of the winter melon vine; a green melon with pale green to orange flesh that keeps well
any of a variety of muskmelon vines having fruit with a smooth white rind and white or greenish flesh that does not have a musky smell	any of a variety of muskmelon vines having fruit with a smooth white rind and white or greenish flesh that does not have a musky smell