accent vs speech pattern

accent and speech pattern both are nouns.

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

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

accent (noun)	speech pattern (noun)
the relative prominence of a syllable or musical note (especially with regard to stress or pitch)	distinctive manner of oral expression
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)	speech pattern (verb)
put stress on; utter with an accent
to stress, single out as important