accent vs emphasise

accent is a noun but emphasise is not a noun.

Word	Noun	Adjective	Verb	Adverb
accent	Yes	No	Yes	No
emphasise	No	No	Yes	No

As verbs, accent and emphasise are synonyms defined as:

Other synonyms of accent include accentuate, emphasize, punctuate, stress.

As verbs, emphasise is a hyponym of accent; that is, emphasise is a word with a more specific, narrower meaning than accent:

accent (noun)	emphasise (noun)
the relative prominence of a syllable or musical note (especially with regard to stress or pitch)
distinctive manner of oral expression
a diacritical mark used to indicate stress or placed above a vowel to indicate a special pronunciation
the usage or vocabulary that is characteristic of a specific group of people
special importance or significance

accent (verb)	emphasise (verb)
put stress on; utter with an accent	to stress, single out as important
to stress, single out as important	give extra weight to (a communication)