high table vs dining table

high table and dining table both are nouns.

Word	Noun	Adjective	Verb	Adverb
high table	Yes	No	No	No
dining table	Yes	No	No	No

As nouns, dining table is a hypernym of high table; that is, dining table is a word with a broader meaning than high table:

high table: a dining table in a dining-hall raised on a platform; seats are reserved for distinguished persons
dining table: a table at which meals are served

Other hypernyms of high table include board.

high table (noun)	dining table (noun)
a dining table in a dining-hall raised on a platform; seats are reserved for distinguished persons	a table at which meals are served