pine-weed vs pineweed

pine-weed and pineweed both are nouns.

Word	Noun	Adjective	Verb	Adverb
pine-weed	Yes	No	No	No
pineweed	Yes	No	No	No

As nouns, pine-weed and pineweed are synonyms defined as:

pine-weed and pineweed: annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers

Other synonyms of pine-weed include Hypericum gentianoides, nitweed, orange grass.

pine-weed (noun)	pineweed (noun)
annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers	annual wiry-stemmed North American weed with minute scalelike leaves and small yellow flowers