wasteland vs heathland

wasteland and heathland both are nouns.

Word	Noun	Adjective	Verb	Adverb
wasteland	Yes	No	No	No
heathland	Yes	No	No	No

As nouns, heathland is a hyponym of wasteland; that is, heathland is a word with a more specific, narrower meaning than wasteland:

wasteland: an uninhabited wilderness that is worthless for cultivation
heathland: a tract of level wasteland; uncultivated land with sandy soil and scrubby vegetation

Other hyponyms of wasteland include heath.

wasteland (noun)	heathland (noun)
an uninhabited wilderness that is worthless for cultivation	a tract of level wasteland; uncultivated land with sandy soil and scrubby vegetation