designer vs deviser

designer and deviser both are nouns.

Word	Noun	Adjective	Verb	Adverb
designer	Yes	No	No	No
deviser	Yes	No	No	No

As nouns, deviser is a hypernym of designer; that is, deviser is a word with a broader meaning than designer:

Other hypernyms of designer include contriver, planner.

designer (noun)	deviser (noun)
someone who creates plans to be used in making something (such as buildings)	a person who makes plans
someone who designs clothing
a person who specializes in interior design
a person who devises plots or intrigues
someone who specializes in graphic design