tallboy vs highboy

tallboy and highboy both are nouns.

Word	Noun	Adjective	Verb	Adverb
tallboy	Yes	No	No	No
highboy	Yes	No	No	No

As nouns, tallboy and highboy are synonyms defined as:

tallboy and highboy: a tall chest of drawers divided into two sections and supported on four legs

tallboy (noun)	highboy (noun)
a tall chest of drawers divided into two sections and supported on four legs	a tall chest of drawers divided into two sections and supported on four legs