bell-shaped curve vs normal curve

bell-shaped curve and normal curve both are nouns.

Word	Noun	Adjective	Verb	Adverb
bell-shaped curve	Yes	No	No	No
normal curve	Yes	No	No	No

As nouns, bell-shaped curve and normal curve are synonyms defined as:

bell-shaped curve and normal curve: a symmetrical curve representing the normal distribution

Other synonyms of bell-shaped curve include Gaussian curve, Gaussian shape.

bell-shaped curve (noun)	normal curve (noun)
a symmetrical curve representing the normal distribution	a symmetrical curve representing the normal distribution