designer vs specialiser

designer and specialiser both are nouns.

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

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

designer: a person who specializes in interior design
specialiser: an expert who is devoted to one occupation or branch of learning

Other hypernyms of designer include specialist, specializer.

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

designer: someone who specializes in graphic design
specialiser: an expert who is devoted to one occupation or branch of learning

Other hypernyms of designer include specialist, specializer.

designer (noun)	specialiser (noun)
someone who creates plans to be used in making something (such as buildings)	an expert who is devoted to one occupation or branch of learning
someone who designs clothing
a person who specializes in interior design
a person who devises plots or intrigues
someone who specializes in graphic design