wetland vs swampland

wetland and swampland both are nouns.

Word	Noun	Adjective	Verb	Adverb
wetland	Yes	No	No	No
swampland	Yes	No	No	No

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

wetland: a low area where the land is saturated with water
swampland: low land that is seasonally flooded; has more woody plants than a marsh and better drainage than a bog

Other hyponyms of wetland include bog, peat bog, fen, fenland, marsh, marshland, swamp.

wetland (noun)	swampland (noun)
a low area where the land is saturated with water	low land that is seasonally flooded; has more woody plants than a marsh and better drainage than a bog