bedding plant vs bedder

bedding plant and bedder both are nouns.

Word	Noun	Adjective	Verb	Adverb
bedding plant	Yes	No	No	No
bedder	Yes	No	No	No

As nouns, bedding plant and bedder are synonyms defined as:

bedding plant and bedder: an ornamental plant suitable for planting in a flowerbed

bedding plant (noun)	bedder (noun)
an ornamental plant suitable for planting in a flowerbed	an ornamental plant suitable for planting in a flowerbed