terrace vs tableland

terrace and tableland both are nouns.

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

As nouns, tableland is a hypernym of terrace; that is, tableland is a word with a broader meaning than terrace:

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

Other hypernyms of terrace include plateau.

terrace (noun)	tableland (noun)
usually paved outdoor area adjoining a residence	a relatively flat highland
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)

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