flag of truce vs white flag

flag of truce and white flag both are nouns.

Word	Noun	Adjective	Verb	Adverb
flag of truce	Yes	No	No	No
white flag	Yes	No	No	No

As nouns, flag of truce and white flag are synonyms defined as:

flag of truce and white flag: flag consisting of a piece of white cloth that is hoisted to signal surrender or to ask for a truce

flag of truce (noun)	white flag (noun)
flag consisting of a piece of white cloth that is hoisted to signal surrender or to ask for a truce	flag consisting of a piece of white cloth that is hoisted to signal surrender or to ask for a truce