emphatic vs emphasis

emphatic is not a noun while emphasis is a noun.

Word	Noun	Adjective	Verb	Adverb
emphatic	No	Yes	No	No
emphasis	Yes	No	No	No

emphatic (noun)	emphasis (noun)
	intensity or forcefulness of expression
	the relative prominence of a syllable or musical note (especially with regard to stress or pitch)
	special and significant stress by means of position or repetition e.g.
	special importance or significance

emphatic (adjective)	emphasis (adjective)
forceful and definite in expression or action
sudden and strong
spoken with emphasis