planner vs designer

planner and designer both are nouns.

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

As nouns, designer is a hyponym of planner; that is, designer is a word with a more specific, narrower meaning than planner:

Other hyponyms of planner include intriguer, maneuverer, manoeuvrer, plotter, schemer, strategian, strategist, tactician.

planner (noun)	designer (noun)
a notebook for recording appointments and things to be done, etc.	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