tableland vs terrace

tableland and terrace both are nouns.

Word	Noun	Adjective	Verb	Adverb
tableland	Yes	No	No	No
terrace	Yes	No	Yes	No

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

tableland: a relatively flat highland
terrace: a level shelf of land interrupting a declivity (with steep slopes above and below)

Other hyponyms of tableland include mesa, table, bench.

tableland (noun)	terrace (noun)
a relatively flat highland	usually paved outdoor area adjoining a residence
	a row of houses built in a similar style and having common dividing walls (or the street on which they face)
	a level shelf of land interrupting a declivity (with steep slopes above and below)

tableland (verb)	terrace (verb)
	make into terraces as for cultivation
	provide (a house) with a terrace