pickerelweed vs pickerel weed

pickerelweed and pickerel weed both are nouns.

Word	Noun	Adjective	Verb	Adverb
pickerelweed	Yes	No	No	No
pickerel weed	Yes	No	No	No

As nouns, pickerelweed and pickerel weed are synonyms defined as:

pickerelweed and pickerel weed: American plant having spikes of blue flowers and growing in shallow water of streams and ponds

Other synonyms of pickerelweed include Pontederia cordata, wampee.

pickerelweed (noun)	pickerel weed (noun)
American plant having spikes of blue flowers and growing in shallow water of streams and ponds	American plant having spikes of blue flowers and growing in shallow water of streams and ponds