Poppy Day vs Remembrance Day

Poppy Day and Remembrance Day both are nouns.

Word	Noun	Adjective	Verb	Adverb
Poppy Day	Yes	No	No	No
Remembrance Day	Yes	No	No	No

As nouns, Poppy Day and Remembrance Day are synonyms defined as:

Poppy Day and Remembrance Day: the Sunday nearest to November 11 when those who died in World War I and World War II are commemorated

Other synonyms of Poppy Day include Remembrance Sunday.

Poppy Day (noun)	Remembrance Day (noun)
the Sunday nearest to November 11 when those who died in World War I and World War II are commemorated	the Sunday nearest to November 11 when those who died in World War I and World War II are commemorated