As adjectives the difference between parenthetical and metaphorical
is that parenthetical is using, containing, or within parentheses (like this) while metaphorical is pertaining to or characterized by a metaphor; figurative; symbolic.
As a noun parenthetical
is a word or phrase within parentheses.
parenthetical
English
Adjective
(-)
using, containing, or within parentheses (like this)
that explains or qualifies something
that is incidental
Noun
(
en noun)
a word or phrase within parentheses