flash card vs flashcard

flash card and flashcard both are nouns.

Word	Noun	Adjective	Verb	Adverb
flash card	Yes	No	No	No
flashcard	Yes	No	No	No

As nouns, flash card and flashcard are synonyms defined as:

flash card and flashcard: a card with words or numbers or pictures that is flashed to a class by the teacher

flash card (noun)	flashcard (noun)
a card with words or numbers or pictures that is flashed to a class by the teacher	a card with words or numbers or pictures that is flashed to a class by the teacher