speech pattern vs accent

speech pattern and accent both are nouns.

Word	Noun	Adjective	Verb	Adverb
speech pattern	Yes	No	No	No
accent	Yes	No	Yes	No

As nouns, speech pattern and accent are synonyms defined as:

speech pattern (noun)	accent (noun)
distinctive manner of oral expression	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

speech pattern (verb)	accent (verb)
	put stress on; utter with an accent
	to stress, single out as important