flowerpot vs planter

flowerpot and planter both are nouns.

Word	Noun	Adjective	Verb	Adverb
flowerpot	Yes	No	No	No
planter	Yes	No	No	No

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

flowerpot (noun)	planter (noun)
a container in which plants are cultivated	a decorative pot for house plants
	the owner or manager of a plantation
	a worker who puts or sets seeds or seedlings into the ground