exclamation mark vs exclamation point

exclamation mark and exclamation point both are nouns.

Word	Noun	Adjective	Verb	Adverb
exclamation mark	Yes	No	No	No
exclamation point	Yes	No	No	No

As nouns, exclamation mark and exclamation point are synonyms defined as:

exclamation mark and exclamation point: a punctuation mark (!) used after an exclamation

exclamation mark (noun)	exclamation point (noun)
a punctuation mark (!) used after an exclamation	a punctuation mark (!) used after an exclamation