costumer vs designer

costumer and designer both are nouns.

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

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

costumer: someone who designs or supplies costumes (as for a play or masquerade)
designer: someone who designs clothing

Other hypernyms of costumer include clothes designer, couturier, fashion designer.

costumer (noun)	designer (noun)
someone who designs or supplies costumes (as for a play or masquerade)	someone who creates plans to be used in making something (such as buildings)
	someone who designs clothing
	a person who specializes in interior design
	a person who devises plots or intrigues
	someone who specializes in graphic design